alleryFor a concave mirror, focal length f relates to radius of curvature R as:
Af = R/2
Bf = 2R
Cf = -R
Df = R
Answer & Solution
Correct answer: A. f = R/2
**For spherical mirrors (small aperture):** f = R/2. Concave (converging) mirror: positive f.
**Convex (diverging):** negative f by convention.
Holds for paraxial rays.
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