The focal length of the convex mirror is 20 cm, its radius of curvature will be:

30 cm

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45 cm

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40 cm

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80 cm

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Solution

The correct option is C
40 cm

The focus is located at $\frac{R}{2}$ distance from the spherical mirror. This distance is called focal length. Hence, $f = \frac{R}{2}$ . Thus, R=2f.

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