alleryStart learning →The relation between radius of curvature R and focal length f of a spherical mirror is
Af = 2R
BR = f
CR = 2f
DR = f/2
Answer & Solution
Correct answer: C. R = 2f
1. The focus is where paraxial parallel rays meet after reflection.
2. Geometry places it midway between the pole and centre of curvature.
3. So the radius of curvature is twice the focal length, R = 2f.
_Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_
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