The focal length of a convex mirror is $20$ cm. What will be radius of curvature?

10

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20

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30

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40

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Solution

The correct option is D $40$ cm
Using the formula $f$ = $\frac{R}{2}$ , we can get the answer.
where $f$ is focal length and $R$ is radius of curvature
$R = 2 f$
f=20 cm

Therefore R= $20 \times 2$ =40 cm

Since the focal length of a convex mirror is positive $R$ is also positive.

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[MP PMT 1989]

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