physics xf: concave lens

7/28/2019 Physics XF: Concave Lens

1/32

CONCAVE LENSBy: Amelia, Ellen, Felix, Verencya

IMMANUEL CHRISTIAN SCHOOL

(SENIOR HIGH)

BILINGUAL CLASS

2012-2013

PHYSICS GRADE X


2/32

LENZVS MIRRORZ Lenz R da OPPOSITE of mirrorz

They REFRACT da lightz, not REFLECT it. Henz,

lightz goes through lenz but in a ztate of refracted

instead of reflected like in mirrorz.

If a MIRROR iz a DIVERGENT, then da LENZ

counterpart iz CONVERGENT, n VICE VERSA.


3/32

THINZINDAMIDDLEZ

THICKZINDAEDGEZ


4/32

PICTURE


5/32

DIFFERENCE


6/32


7/32

What is Focal Length???

half a radius


8/32

The incident beams that are parallel to the main axis arerefracted divergently, derived from the first focal point.


9/32

The rays that come toward the other focal point arerefracted in a parallel fashion to the main axis


10/32

The incident rays that pass through the center of thelens are transmitted without being refracted


11/32

--------------------


12/32

IMAGE FORMATIONZ


13/32

IMAGE FORMATIONZ


14/32

IMAGE FORMATIONZ


15/32

CONCLUSIONZ

Smallerrr

UprightzVirtualz

ALWAYzZ.U CAN COUNT ON IT


16/32

Before we proceed

What variables are there?

Objects distance and height Images distance and height

Magnification

Focal length and Radius


17/32

Countingz

we can derive it into

where f and s2 is always negative


18/32

Magnificationz

Equation:

When counting the magnifications value, any minus (negative) value is

negated.

Magnification affects the size of the objects image after being reflectedor refracted.

Magnification can be bigger or smaller than its

original size. If its bigger, we call it magnified. If

its smaller, we call it diminished.


19/32


20/32

EXAMPLE 2

A glass is put 5 cm in front of a concave lens with a

focal length of 20 cm. Calculate the image distance

from the lens and its magnification.


21/32

GREATER = CLOSER image

THE OPTICAL POWER OF LENS ARE DEFINED AS:

P = 1/F

Where F = Focal Length (in Meters(m))

And P = Optical Power of Lens (in Dioptre(D))


22/32

An object is placed 12 cm in front of a

lens and generates image of 3 cm in

size. Find the optical power of lens!

EXAMPLE 1


23/32

A myopia sufferer wears glasses with

focal length of 40cm. In order to be

able to see objects clearly, what is

the power of lens of the glasses?

EXAMPLE 2


24/32

USES

Glasses for Myopia

Telescope

Camera


25/32


26/32


27/32

How is the image formation in concave

lens?


28/32

Mention 3 uses of concave lens!


29/32

Mention 2 differences between

mirror and lens!


30/32

Draw the three beams of concave

lens!


31/32

fighT!

An object of 6 cm is placed 10 cm in front of a concave lens with a focal

length of 30 cm.

Find:

A. The Distance of the Image from the Lens

B. The Magnification

C. The Image Height

D. The Optical Power Of Lens

E. Draw the Ray Diagram


32/32

THANK YOU

physics xf: concave lens

Documents