What is the relation between focal length and radius of curvature of a spherical mirror?
The distance from the pole to the focal point is called the focal length (f).
The relationship between the focal length f and radius of curvature R is R = 2f.
For a spherical mirror the principal focus (F) lies exactly mid-way between the pole (P) and centre of curvature (C). So, the focal length (f) of a spherical mirror is equal to half of its radius of curvature (R).
For a spherical mirror (both for a concave and for convex), the focal length is half of radius of curvature.
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