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

Question

Quizplus · Accepted Answer

Using the mirror formula: 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, we solve for do: 1/10 = 1/do + 1/30, which gives do = 15 cm.

A Concave Spherical Mirror with a Radius of Curvature of 20