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

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Solution

The correct option is B 10
Radius of curvature = 2 x focal length.
So, focal length = $\frac{1}{2} \times$ radius of curvature = $\frac{1}{2} \times 20$ cm = 10 cm

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