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Question
The relation between the focal length f and the radius of curvature R of a spherical mirror is:
Options
\[f = 2R\]
\[f = R\]
\[f = \frac{R}{2}\]
\[f = \frac{R}{4}\]
MCQ
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Solution
The principal focus of a spherical mirror lies midway between the pole and the centre of curvature, so the focal length is half the radius of curvature: \[f = \frac{R}{2}\].
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