modul intensif fizik chapter 5

8/18/2019 Modul Intensif Fizik Chapter 5

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5.1 Understanding reflection of

light.

A student is able to:

5.1.1 Describe the characteristic of the image formed by reflection of light5.1.2 State the laws of reflection of light5.1.3 Draw ray diagrams to show the position and characteristics of the image formed by a plane mirror, cone! mirror and concae mirror 5.1." Describe applications of reflection of light5.1.5 Sole problems inoling reflection of light5.1.# $onstruct a deice based on the application of reflection of light

CHAPTER 5

LIGHT

Learning Obecti!e and Learning O"tco#es

%ill in the blan&s with the suitable terms:

1. 'he characteristics of image when light from an ob(ect is reflected by a plane mirror includes

................................. , same si)e , .................................... from the mirror at perpendicular

line and irtual.

2. 'he *aw of reflection of light states that

i+ the angle of incidence euals to the angle of ...............................................

ii+ the incident ray, the reflected ray and ......................................... are all lie at the same

plane

3. -a+ $omplete the image of * in the diagram of reflection below.

Prepared & edited by:

Syaza Izzaty Ismail

Mirror

Observer’s eye

Light ray fromobject


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-b+ n the diagram aboe,i. Show the light ray direction and the normal line of the mirror,ii. show the angle of incidence and label as i, the angle of reflection and label as r iii. show the distance of ob(ect, lo and distance of image li perpendicular to the mirror

". /hen the parallel rays are directed to concae mirror, the reflected rays will meet at a point

............................... the mirror. 0t is called the ........................................ of the concae mirror.

5. /hen the parallel rays are directed to cone! mirror, the reflected rays will

................................... . /hen the rays are e!trapolated, it will meet at a point

the mirror, its the ................................................. .

#. Diagram below shows three parallel rays are directed to a concae and a cone! lens, drawthe reflected rays and indicate the focal point, % in each case. Show the direction of reflectedrays.

elate the relation between centre of curature, $, with focal point, %, of a mirror.

. $one! mirror is often installed at the cornering of a hidden road and in the conenience store.

'his mirror allows us to see .................................. angle of ob(ects but the si)e of the image is

..............................................

4. Diagram below shows a ray directed on a plane mirror.i+ ses a red 6 blue in& ball pen, draw the normal line and the reflected ray for the gien incident

ray -use protractor and ruler to assist you+. ii+ 7ow, using a pencil draw to show the mirror turned 18o cloc&wise. 'hus, draw the new

normal line and new reflected ray. bsere the changes of angle for the reflected ray.


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". /hen a light ray traels from an optically less dense medium to a denser medium, the angle of

incident ray -at less dense medium+ is ......................................... then the angle of refracted ray

-at denser medium+.

5. 0n the diagram below,a. draw two normal lines of the ray to and from the glass bloc&b. show the refracted light of the glass bloc&c. complete the direction of lightd. indicate the angle of incident, , and the angle of refraction, .

#. Angle of incident or angle of refraction is an angle made between the ray and the

normal line.. ........................................ says that the ratio of is a constant. 0t is &nown as the

.............................................. of a medium -water 6 glass 6 perspe!+, n, where = .

4. 'he speed of light ......................................... as it trael into a medium, therefore the refractie

inde! of a medium n > , simplified n > .

9. Due to refraction of light,

a. a straight straw 6 rod appears ........................................... at the boundary of liuid.

b. the bottom of a pool liuid appears .................................................to the surface that itactually is.


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ir

r

i

sin

sin

ir

v

c


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18. 'he refractie inde! of liuid can be calculated using, n > ,simplified n >.

11. 0n the diagram below use the following steps to construct the refraction of light of a coin in abea&er of water.

a. draw the two normal lines at the boundary of liuidb. draw and show the two rays refracted at the air -further from normal line+c. draw an eye at the correct positiond. from the eye, followed the refracted rays, e!tra?polated dotted lines bac&ward and meet

abo!e the original coin. Draw a dotted oal shape,to represents the image of the coin.

12. 'he phenomenon of refraction of light include ................................. sunrise, ........................

twin&ling stars at night and wriggling of distant ob(ects on hot day.


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d

D


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5.% Understanding total internal

reflection oflight.

A student is able to:5.3.1 ;!plain total internal reflection of light5.3.2 Define critical angle -c+

5.3.3 elate the criticalangle to therefractie inde!

i.e5.3." Describe natural phenomenon inoling total internal

reflection5.3.5 Describe applications of total internal reflection5.3.# Sole problems inoling total internal reflection

1. iagram belo! sho!s a light ray travels thro"gh a semicircle glass bloc#. $f the angle,

of inci%ent is small, most of the light is refracte% b"t some is reflecte%.

Label in the %iagram i& the refracte% light an% reflecte% light

ii& the angle of inci%ent, an% angle of refraction, r.

2. 'he critical angle, c is the inci%ent angle, !hen the ma(im"m refraction occ"rs at r ) *+ o.

On the %iagram belo!, label the critical angle, c an% refraction angle, r.

3. 'he total internal reflection occ"rs !hen,


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c sin

1 η =

i

i


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-a& i& light travels from a ........................................ to a ..............................................

ii& !hen the inci%ent angle, is ...................................... the critical angle, c

-b& name the henomena occ"rs in the %iagram belo!. ..................................................

4. /nother form"la of refractive in%e(, n =

5. 'he henomenon of total refraction of

lights incl"%es

a& mirage in the %esert

b& mirage on hot afternoon on high!ay

c& ...........................................................!

6. 'he henomenon of mirage occ"rs is %"e to the %ifferent layers of hot air, hot air on the gro"n%

is ................. %ense comare !ith col% air at higher level on hot %ay. 'he !ater %rolets from the

clo"% are refracte% ...................................... from the normal line. 0hen the angle of inci%ent ray is

............................................ , it create% a total internal reflection on the ..................................

O"r eye sight sees ............................. as tho"gh there are !ater %ros on the gro"n%.

. efers to the %iagram given belo!

omlete the ath of the ray in the %iagram belo! an% e(lain ho! a mirage is forme%.


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i

csin

1

csin

*+sino

=

Layer of hot air

Layer of cool air

ye

object

gro"n%


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5.& Understanding lenses.

A student is able to:5.".1 ;!plain focal point and focal length5.".2 Determine the focal point and focal length of a cone! lens

and concae lens5.".3 Draw ray diagrams to show the positions and characteristics

of the images formed by a cone! lens and concae lens.5."." Define magnification as5.".5 elate focal length -f+

to the ob(ect distance

-u+ and imagedistance -+ i.e.5.".# Describe, with the aid of ray diagrams, the use of lenses in

optical deices.5.". $onstruct an optical deice that uses lenses.5.".4 Sole problems inoling to lenses.

1. 0hen light asses thro"gh a conve( lens, the light .......................................... to a oint an% !e

call it ............................................... onve( lens is also #no!n as a converging lens.

2. oncave lens is also #no!n as a ................................................... beca"se light asses thro"gh it

%iverge from a oint, the focal oint, .

3. or the ray %iagram belo! fill in the follo!ing labels

7rincile a(is, P, Otical centre, O, ocal oint, F, focal length, f

4. omlete the follo!ing ray %iagrams to fin% o"t the images of each one.8iven the characteristics of images incl"%es real or virt"al, "right or inverte%,

%iminishe% 9 smaller, same or magnifie% or larger. :tate the characteristics for each.


Syaza Izzaty Ismail

u

v m =

v

1

u

1

f

1 +=

haracteristics

of image

i;;;;;..

ii;;;;;.

iii;;;;;


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a&

b&

c&

5. -a& 0hen the object is too near from the conve( lens, the image is virt"al, magnifie% an% "right.

-b& oncave lens ro%"ce only one tye of image that is virt"al, %iminishe% an% "right.


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6. omlete the follo!ing ray %iagram an% name the characteristics for each.

. 'he symbol for image %istance is .............. an% the symbol for object %istance is ................

. 'he form"la for magnification m )

or m )

*. 8iven the form"la can be "se% to solve

otical roblems.

(lain !hat %oes it means !hen f isnegative val"e, f is ositive val"e, v is negative val"e an% v is ositive val"e.

f is negative ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;.

f is ositive ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;.

v is negative ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

v is ositive ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;.

.


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d object of size

Dimageof size

,

,

vu f

111+=

= = = =

haracteristics of image haracteristics of image


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modul intensif fizik chapter 5

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