Question

The Magnification of a real Image produced by a concave mirror of radius of curvature 20 cm is 3. Find the image distance.

Answer 1

R = 20cm, f = R/2 =10cm

P = ? (Distance of the object)

q =2p (from definition of magnification)

Formula for concave mirror is

1/f = 1/p + 1/q

1/f = 1/p + 1/2p

1/f = 3/2p

Answer 2

image distance =15 ans.