Question

Object is placed at a distance of 12 cm and it's real image is formed at a distance of 60 cm by a spherical mirror determine its focal length ​

Answer 1

object distance=-60cm

m=-v/u=1/2

v=1-60/-2=30cm

f=60cm

m=1/3

m=-v/u=1/3

1/60=-2/u

u=120cm