If the radius of curvature $(R)$ of a convex mirror is $30 c m$ . What is its focal length?

$30 c m$

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$60 c m$

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$15 c m$

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$10 c m$

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Solution

The correct option is C
$15 c m$

For a convex mirror, the radius of curvature $R$ , is twice its focal length $f$ .

$R = 2 f$
$30 = 2 f$
$f = 15$

Therefore, the focal length $f = 15 c m$

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