Question:
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Updated On: Jan 13, 2026
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Solution and Explanation
Radius of curvature, R = 20 cm
Radius of curvature of a spherical mirror = 2 × Focal length (f)
R = 2 f
\(f=\frac{R}{2}=\frac{20}{2}=10\) cm
Hence, the focal length of the given spherical mirror is 10 cm.
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