If the radius of curvature of a concave mirror is 20 cm, then its focal length is:
10

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Solution

The correct option is A 10
Given,
Radius of curvature, $R = 20 c m$
We know
Focal length, $f = \frac{1}{2} \times R$
$= \frac{1}{2} \times 20$
$= 10 c m$

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