the radius of curvature of a spherical mirror of focal length f cm is-
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The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2.
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From the given question the correct answer is :
the radius of curvature of a spherical mirror of focal length f cm is-
Radius of curvature of a spherical mirror = 2 × Focal length (f)
R = 2 f f = R /2 = 20 / 2 = 10
Hence, the focal length of the given spherical mirror is 10 cm.
In order to determine the focal length of a spherical mirror we should know the radius of curvature of that mirror. The distance from the vertex to the center of curvature is called radius of curvature. The focal length is half the radius of curvature.
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