daily work organizer tuesday question of the day: how do we know how far stars are from earth? do...
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Daily Work Organizer
Tuesday Question of the Day: How do we know how far stars are from earth?
Do Now:
Is your intelligence something very basic about you that you can’t really change?
Why or why not?
Agenda: • Introduction to Light• Cornell notes
HomeworkHomework:Finish Cornell
Notes
Put your HW next to your DWO. Remember to pick up your graded
work from the box!
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Readers TheatreExcerpt from: The secret to raising
smart kids1. Read the paragraph out loud
together2. Read every other line and switch
(partner 1 will read the first line, and partner 2 will read the second)
3. When you get to the end of the paragraph, start again! Try using funny accents!
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It’s what we see…
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Light Speed
•light around the earth
•300,000,000 m/s
•3 x 108 m/s
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Light Speed
•Just over a second from the moon
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Light Speed
•8 minutes from the sun
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Light Speed
•4.2 years from Alpha Centauri! (second nearest star)
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Lightyear
•170, 000 lightyears away
•How many years ago did it occur?
How far light travels in 1 year
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Refraction•the bending of light when passing
through a new (transparent) substance
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Plane Mirrors: The Flat Mirrors
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Plane Mirrors
•Incident ray hits the mirror
•Reflected ray is the ray that bounces off
•The Normal is the perpendicular line from mirror
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Parallaxreal screw (behind mirror)
image of screw
mirror• Parallax can be
used to find image location
• Parallax makes objects appear to move when not in the same place
• Try it
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Parallax
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Parallax
• Move head to the side
• If the image and real screw separate, then not at same place
• Try it
mirror
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Parallax
• If the two move together, they are at same place
• Try it
mirror
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How do scientists calculate the distance
between Earth and some other star?
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Remember to pick up your graded work from the box!
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Now, to the Lab
Part I (pg 6)
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Daily Work OrganizerMonday Question of the Day:
Do Now:Draw a ray of light that strikes a mirror at an angle of 30° from the mirror
Agenda: • Cornell notes
HomeworkHomework:Finish Cornell Notes
Reading Log for pg 23
Draw, measure, and label the: Normal, Incident & reflective angles.
Bonus: How could you calculate the Incident & Reflective angles without drawing anything?
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Homework problems: pg 14-17
Due on Wednesday/ThursdayEvery Scholar: Problems 1, 2, 3Honors physics: above problems plus 4
Due FridayEvery Scholar: Problems 6, 7, 10Honors physics: above problems plus 8, 9 Extra Credit:
problem 5 & any Honors problems
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Lab 1 (pg 6-11)Due Today by
3:45pm to room 308Also: Several scholars forgot to write
their names on their labs...
TURN IN DAILY WORK ORGANIZERS!
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Jobs
Whiteboard eraserPowerpoint master2 students to Handback
assignments
Salary: 1 ticket per day
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Challenge ProblemsDo Challenge problems when
you are done with classworkExcellent chance to review
material that will be on the test!Later on it will become an
excellent opportunity to review old material that will be on the final
Turn in completed worksheets to the folder and receive 3 tickets
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Upcoming events
1st physics problem set due soon!Advice: • Work with friends• Start NOW (Do not wait till last
minute)• Ask for help!
Binder quiz1st quiz on Friday
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Incidence
The intersection of light with a surface
Intersection
mirror
Incidence Angle
Whenever light strikes a surface, the angle of incidence is equal to the
angle of reflection.
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Reflection
An amount of light, heat or sound that is thrown back
Throwing back, bouncing off,
mirror
Reflected Angle
Both Edward Cullen and Dracula cannot see their reflections in the mirror. How do they style their hair?
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Normal
A perpendicular (90°) intersection of a line or surface
Perpendicular, right angle, 90°
mirror
normal
The line normal to the mirror is 90° from the mirror. The normal is between the incident and reflected rays.
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Reflection
Virtual Image of the nose
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2 Laws of Reflection
i = rObject distanc
e
=Image distanc
e
di to mirror) =
do (to mirror)
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Image Formation
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Diffuse Reflectors
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What is a summery?
INCLUDES ALL MAIN POINTS!A paragraph written in full
sentences. Example: The angle of incidence is equal to the angle of Reflection. The Normal is an imaginary line drawn 90 degrees to the mirror and is an equal number of degrees from both the incident and reflected rays.
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Daily Work OrganizerMonday Question of the Day:
Do Now:Complete Reflection worksheet #1
Agenda: • Homework Questions• Vocab• Reflection Worksheet • Lab Grades
HomeworkHomework:Problems 1, 2, 3
Honors: + 4
When done: Start on Worksheet #2 or #3
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Find the Object
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Let’s try it
turn to pg 15
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Find the Object
Image to eye
14.5 cm
Object
14.5 cm
Apparent path of light
Actual path of light
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Yourself in a Mirror
Minimum height of mirror?
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Tip for #4
Work backwards! Where do the rays need to reach to let everything be seen?
Tip for #6In order to focus you camera you
must know the distance between the camera and the image
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Class Pointsaka: Tickets for everyone!
100% homework completion Everyone is in their seats, silently
doing the Do Now when the bell rings
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Parallel
Parallel lines always have the same distance between them
• Parallel of latitude
• Never crossing• 并行 (?)
Parallel lines
Parallel lines will never cross
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Black Holes
The mass inside a black hole is infinitely large.
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Infinite无限
Limitless or endless. Impossible to measure or calculate
Black Holes! Larger than the largest number
The mass inside a black hole is infinitely large. The number closest to 0 that is not 0 is infinitely small
∞
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Image
An optical appearance produced by light.
• Light rays• Not always
behind a mirror or lens
Interesting fact: the image is not always BEHIND the mirror!
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Object
The physical object that produces an image
• Examples: ME when I look in the mirror!
When Bella looks into the mirror she is the object. Her reflection is the image.
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Reflection Lab Grades
Total possible points: 50Examples• -2 on the front means you earned 48 / 50 points or 96%• -10 on the front means you earned 40 / 50 points or 80%
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Common Shortfalls =(No Full Sentences
Ex:
Example of a great response:
4.2cm and 4.5 cm. 5%
The distance from the object to the mirror is 7.7cm and the distance from the mirror to the image is 7.6cm. The
percent difference is 1.3% which indicates that these distances are very
close.
What is 4.2cm???
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Common Shortfalls =(
Not labeling the Image in Part 1
Step 9 of the procedure says: Label the image
If you want to discuss lab grades:1. Write a note. Staple it to the lab
and turn it into the re-grade folder2. Talk to me after school in room
308
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Lab Corrections
Due 1 week from the day it was due (MONDAY Tuesday)
Correct your lab and staple a note to the front telling me:
1. what you corrected 2. your original mistake
NOTE: You can not earn points back by labeling the image…
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1st Quiz on Friday!
Be prepared!
What will the quiz cover?oWorksheets from class oHomeworko Vocabulary
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Daily Work OrganizerWednesday Question of the Day:
Do Now:
Continue to work on Reflection Worksheets
If you finish: Challenge Problems! =)
Agenda: • Homework review• Curved mirrors (42)
Homework
Fridays Homework:Corrections to first
problem setProblems 6, 7, 8Honors: + 9, 10
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Problem 1
What happens to the surface of the road when it is wet?
Why?
Water fills in crevices (bumps) creating a smooth surface for light to reflect upon
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Reflection on a smooth surface
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Headlight on a dry road
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Headlight on a dry road
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Image
An optical appearance produced by light.
• Light rays• Not always
behind a mirror or lens
Interesting fact: the image is not always BEHIND the mirror!
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Object
The physical object that produces an image
• Examples: ME when I look in the mirror!
When you look into the mirror you are the object. Your reflection is the image.
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Converge
Come together from different directions to eventually meet
• Come together• Cross• Eventually meet
The students will converge in the cafeteria
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Diverge
Separate and go in different directions
• Separate• Grow apart • Turn away
Monkeys and Humans diverged from a common ancestor
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Daily Work OrganizerFriday Question of the Day:
Do Now: A man is standing between 2 parallel mirrors and facing left.
Agenda: • Homework review• Quiz
HomeworkTuesday’s Homework:Page 24-27
Extra Credit: pg 20
mirror
2.0 m
1.0 m
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If you did any extra credit
problems1.Write your name on
the homework2.Staple your
homework3.Turn it in TODAY
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Do Now
mirror
object
mirror
3.0 m
2.0 m
2.0 m
1.0 m
1.0 m
A man is standing between 2 parallel mirrors looking
to the left. How far
away from the person are the first
three images he
sees?
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Problem 6mirror
2.0 m
2.0 m
4.5 m
4.5 m
object
image
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Problem 7: 25° with the surface of the
mirror… ?
Mirror
25°
normal
θ
θ = incident angle
90° = θ + 25°
90° – 25° = θ
65° = θ
But what is the question is asking?
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Reflection problem 10
Virtual Image of the nose
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Daily Work OrganizerTuesday Question of the Day:
Do Now:
Agenda: Cornell notesLast week’s quizDiscuss Activity pg 24-27Lab demo
HomeworkHomework:Read Lab 2 (34-35)Turn in Activity pgs
24-28Pre-Lab (honors)
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Curved Mirrors
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Curved Mirror Vocab
C = center of curvature radius of curvature f = focal point - rays converge F = focal length f = C / 2
C f
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Center of Curvature
• Center of sphere
The center of curvature of a 10 meter sphere is 5 meters
Radius of the sphere the mirror was made from
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Focal Point
• Where rays cross• “ “ come together• “ “ intersect
Every ray crosses the focal point
Point at which rays converge (come together)
f
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Do Now: 4 problems
1. Where is the center of curvature of a 12 inch basketball?
2. A curved mirror has a center of curvature of 16 cm. What is the focal length?
1. The center of curvature is the center of the basketball = 6 inches
radially inwards
2. The focal length is ½ the center of curvature = 8cm
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What is the center of curvature of a golden
globe award?
(the diameter of the globe is
10 cm)
The center of curvature is the center of the sphere
5 cm
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What is the focal length of the death star laser if the radius of the laser dish is
120m?
The focal length is ½ the center of curvature
= 60 meters
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Homework problems: pg 28
Due on Wednesday/ThursdayEvery Scholar: Read Lab 2 (pg 34-35)Activity pages 24 - 28Honors physics: Above plus Pre-lab
Due FridayEvery Scholar: Lab 2 (pgs 34-37)Extra credit mini project on page 20Extra Credit:
Eye chart mini project pg 20
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Jobs
Whiteboard eraserPowerpoint master2 students to Handback
assignments
Salary: 1 ticket per day
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BoBABinder of Brilliant Answers
BoBA can be found in room 308
Excellent way to check your HW answers
Make sure you’re studying the right answers before tests & quizzes
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Class Goal!
85%
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Class Goal!
80%
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QUIZ!
1° Class Average: 85%2° Class Average: 74%3° Class Average: 65.3%4° Class Average: 73.8%6° Class Average: 70.3%
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Quiz Retakes
Friday at lunch, 12:25pm or after school at 3:25pm, Room 308
No late entry permitted
Option 1: Turn in your corrected 1st quiz and receive the higher of your two scoresOption 2: Retake the quiz and receive the average of your two scores
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Questions about homework or quizzes?
Room 308Tuesday 3:10Thursday 3:10
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Question 6 (2 points)
•Incident ray hits the mirror
•Reflected ray is the ray that bounces off
•The Normal is the perpendicular line from mirror
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Apparent path
Actual path
Object
Question 7 (3 points)
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Activity pg 24-28
Due on Wednesday / ThursdayWill be gradedIgnore /skip question 3 on page
27
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Pg 25Your ray diagram should look something like this:
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Pg 25
1. What is the orientation of the rays after being reflected from the mirrors surface?
The reflected rays diverge. The rays will never intersect
(cross) because they are diverging
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Pg 25
2. How does the focal length compare to the center of curvature?
The focal length is ½ the center of curvature
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Pg 26
3. If you had a 10 cm Christmas tree bulb that was 10 cm in diameter, what would it’s focal length be?
The focal length is ½ the center of curvature = 5 cm
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Pg 27Your ray diagram should look something like this:
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Question 5, pg 28
Draw tangent lines
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Do Now: Solve for x
1. x/6 = 1/3
2. x/8 = 1/2 + 1/4
3. x/(do di )= 1/do + 1/di
4. 1/x = 1/do + 1/di
1. X = 2
2. X = 6
3. X = do + di
4. X = dodi / (do+ di)
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Real Image
• Image in front of mirror
• Only created by concave mirrors
Movie theatre projectors create real images on the big screen.
Occur when light rays from an object reflect from a mirror and converge
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Virtual Image
Occur when light rays from an object reflect off a mirror and diverge
• Virtual images are behind the mirror
My reflection in a plane mirror is a virtual image because the reflected rays converge behind the mirror
2.0 m
object
2.0 m
image
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Lab 2!
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How do you calculate the focal length of a curved
mirror?1/f =1/do +1/di
1/Focal length = 1/object distance + 1/image
distance
f = dodi / (do + di)
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Note
Ignore question 2 on page 37Ignore the bottom row discussing
convex mirror data on page 38
We will talk about convex mirrors in class on Friday
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Your data tableImage Size; either larger, smaller,
or same. Image Orientation; either upright
or inverted. Image Position; either behind
mirror (distance will be negative), between mirror and object, at object, or beyond object
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AdviceMark & number all 11 object and
image distances on your paper
Record the object size, orientation & location of each image (skip recording the object and image distances, you can measure those later)
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AdviceGroup Roles • 1 person measure the object and
image distances
• 1 person calculate the focal point
• Remaining group members should do part 2 of the lab
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What is f? What is C?What is the relationship between f and C?
What is the image distance?
What is the object distance?
f = the focal lengthC = the center of Curvature
f = C/2 The focal length is ½ of the center of
curvature
di= distance from paper to mirror
do = distance from light filament to mirror
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Curved Mirrors
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Daily Work OrganizerFriday Question of the Day: How can you find an
image location without looking into a mirror?
Do Now:
Answer the problems on pg 18-19
Agenda: Cornell notes (3-6)Mirror ray diagramsDiscuss lab results
HomeworkMonday’s Homework:Finish 30-33
Reading log: 39 - 40
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Pg 37 Convex mirror
Position: Size: Larger / Smaller / SameOrientation: Upright / InvertedType: Real / Virtual
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Convex mirrorpg 37
Position: Size: Larger / Smaller / SameOrientation: Upright / InvertedType: Real / Virtual
VirtualUprightSmaller
Behind the mirror
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Convex mirror
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Curved Mirror Vocab
C = center of curvature radius of curvature f = focal point - rays converge F = focal length f = C / 2
C f
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Real vs Virtual Images
Concave MirrorImage in frontImage is RealLight rays
convergeUse a Card
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Real vs. Virtual Images
Concave Mirror
Image behind mirror
Image is virtual
Appears to converge
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Concave Mirrors
C f
through the focal point!Incoming Parallel rays reflect:
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Concave Mirrors
C f
parallel!Rays through (or from) f reflect:
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Concave Mirrors
C f
back through C!Rays through C reflect:
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Convex Mirrors
C f
away from focal point!Incoming parallel rays reflect:
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Note: Only the red lines are used to locate the image
Convex Mirrors
C f
parallel!Rays towards focal point reflect:
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Convex Mirrors
C f
back away from C!Rays towards C reflect:
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Image Location
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Choose easiest
pathsParallelFocal Point(Only need 2) C “check”
image
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Finding the ImageDraw ray pathsIdentify
Characteristics
Beyond C
larger
inverted
Real
R = Region S = Size O = Orientation T = Type of Image
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Now Go Make Your Own!
Pages 30-33
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Daily Work OrganizerFriday Question of the Day:
Do Now:
Agenda: HomeworkTuesday’s Homework:Finish 30-33
Problems: 43-44
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HomeworkDue Tuesday
Every Scholar: Ray Diagrams (p. 30-33)
Due WednesdayProblems (p. 43 – 47)
Due FridayCornell notesSigned progress reportPhysics text in binder
Extra Credit:
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Answers pg 31
R = Region S = Size O = Orientation T = Type of Image
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Image Characteristics
Concave and Convex
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Concave: Object at center of Curvature
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ConcaveObject between C and F
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ConcaveObject between F and Mirror
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Mirror EquationsSolving for f
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Mirror EquationsMagnificationReally 3 different equations
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Mirror Equations
ImageDistance
FocalLength
Positive
negative
Concave mirrors
Convex mirrors
In front of mirror
Behind mirror
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Let’s try some examples!
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1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.a. Find the focal length of the mirrorLet’s go over how to approach word
problems…
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Solving Word Problems
1. List your given information (numbers you can use in eqns) make sure to label them with a
variable sometimes this includes a picture
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1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.a. Find the focal length of the mirror Given:
f = ?
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Solving Word Problems
2. Write out the equation you will use write it the way you will use it
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1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.a. Find the focal length of the mirror Given:
f = ?
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Solving Word Problems
3. Plug your numbers into the equation
Do not forget your units!
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1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.a. Find the focal length of the mirror Given:
f = ?
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Solving Word Problems
4. Calculate and write your answer! Box it!
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1.5 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.a. Find the focal length of the mirror Given:
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1.5 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.b. Find the Magnification of her image. Given:
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1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.a. What type of image is it? Why?
Answer:Image is virtual.Why? Because image is upright.
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1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.b. What type of mirror is it? Why?
Answer:Mirror is convex.Why? Because image is smaller and virtual.
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1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.c. Find the center of curvature
1st, find di
Given:
virtual!C = ?
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1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.c. Find the center of curvature
solve for f
Given:
C = ?
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1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.c. Find the center of curvature
solve for C
Given:
C = ?
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1.3 A convex mirror has a center of curvature of 68 cm. If the image is located 22 cm from the mirror, where is the object?Given:
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Daily Work OrganizerTuesday Question of the Day:
Do Now:
Answer problems 2-5 on pg 41
Agenda: Homework
W/R Homework:Finish p. 43-47
Extra Credit:Honors
problems 12, 13, 14
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Answers
1. C2. A3. C4. D5. D
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HomeworkDue Wednesday / Thursday
Problems (pg. 43 – 47)Honors problems: #12-14
Due FridayCornell notesSigned progress reportPhysics text in binder
Extra Credit:Honors
problems 12, 13, 14
On pg 46
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Pg 43-47 Each question is worth 3 points…
1 point for writing the given information on the left hand side and an equation you could use to solve the problem
1 point for the correct answer
1 point for a boxed answer
Extra Credit:Honors
problems 12, 13, 14
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Cornell Notes
1/3 for completeness
1/3 for notes and questions in margins
1/3 for summaries
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Use your ray diagrams on page 30-33 to fill out
the table on pg. 38 Type of mirror
Object position
Image
Position Relative Size
Orientation
Type
concave
Mirror to focus
Center of Curvature
At C Same Inverted Real
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Daily Work OrganizerTuesday Question of the Day:
Do Now:
Answer problems 6-10 on pg 42(you can use your table on pg 38)
Agenda: Homework
Friday Homework:Finish all cornell
notesFinish 43-47
Signed Progress Report
PHYSICS TEXT!
Extra Credit:Honors
problems 12, 13, 14
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Answers
6. E7. A8. C9. B10.E
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Convex
• Outside of a sphere• Convex mirrors
have negative focal points
• - f and - C
Convex mirrors only produce virtual images. The image is always behind the mirror.
A surface that curves like the outside (exterior) of a sphere
object
+ -f
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Vocab
WordPicture that reminds you of definition
DefinitionWord or words that remind you of definition
Sentence using word
Concave
If it rains, you could stand under a concave mirror to keep dry. If you stood between the mirror and focal point your image would be virtual.
A surface that curves inwards like the inside of a sphere
object
• Cave• Inside of a sphere• + f and + C
+ -f
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Object beyond C
f
ff
f
f
Object at C
Object between f and C
Object between f and the mirror
C
object
C
object
Image
object
object
C
C Image
Image
Image
Concave Mirrors
Image type:
Image type:
Image type:
Image type:
The focal length is positive for concave mirrors
The Center of curvature is positive for concave mirrors
+ -
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notes
Object anywhere
f
object
C
Image
Convex Mirrors
The focal length is negative for convex
mirrors f C
+ -
Image type:
The object distance is always positive because the object cannot go behind the mirror
Convex only produce virtual images
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Stations!
Station 8• Pink book card• Ray diagrams (pg. 30-
33)• Daily Work Organizer
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Corrections to Practice Problems
A.)di = 22.3 cm
hi = 1.95 cm
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Stations!
Station 1: Spoons…Station 2: Gazing GlobeStation 3: Make-up mirror…Station 4: Concave Mirror…Station 5: Dark BoxStation 6: Practice problemsStation 7: Real vs. virtual imagesStation 8: pg 30-33 + DWO