Question

If f is focal length and R is the radius of curvature, then f = R/2 is valid for * a) Only Convex mirror b) Only Concave mirror c) All types of mirrors d) Only Plane mirrors​

Answer 1

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• b) Only concave mirror.

Answer 2

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c) All types of mirrors.

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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