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Per NCERT, what is the RELATIONSHIP between radius of curvature R and focal length f for a spherical mirror (small aperture)?
AR = f/2
BR = 4f
CR = 2f (focal length = half the radius of curvature)
DR = f
Answer & Solution
Correct answer: C. R = 2f (focal length = half the radius of curvature)
Per NCERT §9.2, for small apertures R = 2f. So focal length is half the radius of curvature.
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