A concave spherical mirror with a radius of 20 cm creates a real image 30 cm from the mirror.How far is the object from the mirror?
A) 50 cm
B) 20 cm
C) 15 cm
D) 7.5 cm
E) 5.0 cm

Question

Quizplus · Accepted Answer

Using the mirror equation 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance. The focal length f is half the radius of curvature, so f = 10 cm. Given di = 30 cm, solving for do gives do = 15 cm.

A Concave Spherical Mirror with a Radius of 20 Cm