Question

A point light source is kept In front of a convex mirror at a distance 40cm.The focal length of the mirror is 40cm. Find the position of image

Answer 1

u=-40cm

f=40cm

1/v+1/u=1/f

1/v=1/f-1/u

1/v=1/40-(-1/40)

1/v=1/40+1/40

1/v=2/40

v=20cm