Question

A concave mirror mirror forms a real image at a distance of 10 cm of the object.if the object is 40cm from the mirror ,the radius of the curvature of the mirror is

Answer 1

v = - 10 cm, u = - 40 cm, 1/f = 1/v + 1/u = 1/-10 + 1/-40 =1/f = 1/-8 = f = -8 R = 2f = R= - 16 it is negative because it is a concave mirror