Q.

The relation between Radius of curvature (R) and focal length (f) is

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a

R=2f

b

f=2R

c

f=3R

d

f=R

answer is B.

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Detailed Solution

 Radius of curvature is observed to be equal to twice the focal length for spherical mirrors with small apertures. Hence R = 2f . We can say clearly that the principal focus of a spherical mirror lies at the centre between the centre of curvature and the pole.

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The relation between Radius of curvature (R) and focal length (f) is