For a spherical mirror (concave or convex) with a small aperture, the focal length (f) is defined as half of its radius of curvature (R). This fundamental relationship is expressed as f = R/2 or R = 2f.
The correct relation between the radius of curvature R and focal length f of a spherical mirror is
Asked in UPSC NDA 2 2020 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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