The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature?
A) -20 cm
B) 20 cm
C) -40 cm
D) 10 cm
E) 40 cm

Name: The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature? A) -20 cm B) 20 cm C) -40 cm D) 10 cm E) 40 cm
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Question

Quizplus · Accepted Answer

The radius of curvature (R) of a mirror is twice the focal length (f). Given the focal length is 20 cm, R = 2f = 2 * 20 cm = 40 cm.

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