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If the radius of curvature of a spherical mirror is 20 cm, its focal length is

Question
If the radius of curvature of a spherical mirror is 20 cm, its focal length is
40 cm
20 cm
10 cm
5 cm
Answer
10 cm
Detailed Explanation
Using R = 2f, f = R/2 = 20/2 = 10 cm.
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