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Q.

Ratio of radius of curvature to that of the focal length of a spherical mirror is

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a

$4 : 1$

b

$2 : 1$

c

$1 : 2$

d

$1 : 4$

answer is B.

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Detailed Solution

$f = \frac{R}{2}$

$2f = R$

$2 = \frac{R}{f}$

$R : f = 2 : 1$

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