Question

An object is placed vertically at a distance 40 cm from a convex lens.
If the height of the object is 10 cm and the focal length of the lens is 20 cm, then What will be the
i) position
ii) size and
iii) nature of the image?
iv) How much bigger will the Image be as compared to the object?​

Answer 1

CONVEX LENS

Given:

u= -40 cm

h'=10 cm

f= 20 cm

Solution :

1. Lens formula,

1/f= 1/v-1/u

1/v= 1/20-1/40

1/v=1/40

v= 40 cm

Image will be formed 40 cm behind the lens.

2. Magnification = v/u=40/-40

=-1

-1=h'/h

h= -h'

h = -10 cm

Image will be 10 cm high.

3. Nature of image : real and inverted

4. Image will of same size as of object size (as magnification is 1)

Answer 2

Answer:

MARK ME AS BRILLIANT