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If the focal length of a spherical mirror is 12.5 less cm, its radius of curvature will be:
(a) 25 cm (b) 15 cm (c) 20 cm (d) 35 cm
(a) 25 cm
Explanation
Given,
Focal length = $f$ = 12.5 cm
To find = R = Radius of curvature
Solution
We know that,
Radius of curvature, $R = 2f$
Putting the given value we get-
$R = 2\times 12.5$
$R = 25 cm$
Hence, radius of curvature will be 25cm.
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