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Magnification

The magnitude...

Question

The magnitude of the radius of curvature of a convex mirror is 40 cm. Its focal length is:

A

-20 cm

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B

20 cm

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C

-80 cm

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D

80 cm

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Solution

The correct option is B 20 cm
Here,
Radius of curvature = 40 cm
Focal length = ½ (Radius of curvature)
Or, f = 40/2 = 20 cm

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