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For spherical mirrors of small aperture, the relationship between radius of curvature R and focal length f is given by

Question
For spherical mirrors of small aperture, the relationship between radius of curvature R and focal length f is given by
R = f
R = 2f
R = f/2
R = 4f
Answer
R = 2f
Detailed Explanation
The chapter states that for spherical mirrors of small aperture, the radius of curvature is found to be equal to twice the focal length, R = 2f.
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