Question

2. A concave mirror forms an image of 20 cm high object
on a screen placed 5:0 m away from the mirror. The
height of the image is 50 cm. Find the focal length of
the mirror and the distance between the mirror and the
object.​

Answer 1

Answer:

Explanation:

O= 0.2m

I-0.5m

v-5m

Therefore,

I/o = v/u

0.5/0.2= 5/u

u= 2m

1/f =. 1/u+1/v

1/f. =. 1/2 + 1/5

1/f =. 7/10

F=. 10/7.