Question

Object is placed at a distance of 4cm from focus of concave mirror.Then image is formed at a distance of 16cm from focus on Same side.What is focal length of mirror??

Answer 1

Explanation:

u = -4cm

v = -16cm

1/f = 1/v+1/u

1/f = 1/-16+ 1/-4

1/f = -3/ 16 ( by taking LCM)

f =- 16/3

Focal length is 5.33cm