Question

Harshit places an object 8 cm in front of a concave mirror. A virtual image is formed 24 cm behind the mirror. What is the focal length f of the concave mirror?

Answer 1

Explanation:

Given,

object distance=8cm=u

Image distance=24cm=v

focal length=f

from mirror formulae

1/f=1/v+1/u

1/f=1/24+1/8

1/f=1+3/24

1/f=4/24

1/f=1/6

f=6