Question

An object is placed at a distance of 10 cm infront of a concave mirror. It forms a real image three times larger than the object. The distance of image from the mirror is

(A) -30 cm

(c) 10 cm

(b) 30 cm

(d) - 10 cm​

Answer 1

Answer: -30

Explanation: The mirror produces three times enlarged image. Where v is the distance between image and mirror and u is the distance between object and mirror. So, radius of curvature = R = 2*-15 = -30 cm which is the required answer.