An object 6 cm high is placed 18 cm in front of a mirror.What type of mirror and what radius of curvature is needed for an image that is upright and 16 cm tall?

Question

Quizplus · Accepted Answer

The image is upright and taller than the object, so the mirror must be concave. The magnification is 16 cm / 6 cm = 2.67. The object distance is 18 cm. Using the thin lens equation, 1/f = 1/do + 1/di, we get f = 9 cm. The radius of curvature is R = 2f = 18 cm.

An Object 6 Cm High Is Placed 18 Cm in Front