The focal length of a concave mirror is $10 c m$ . Find its radius of curvature.

25 c m

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5 c m

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10 c m

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20 c m

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Solution

The correct option is D $20 c m$
The relationship between the radius of curvature and focal length is that the radius of curvature is twice the focal length. In other words, focal length is half the radius of curvature.

In this case, focal length of the concave mirror is given as $10 c m$ .

Hence, the radius of curvature of the mirror is $10 \times 2 = 20 c m$ .

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The focal length of a concave mirror is 10 cm. Find its radius of curvature.

The focal length of a concave mirror is $10 c m$ . Find its radius of curvature.