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A beam of convergent light converges to a point $0.5 m$ in front of the mirror after reflection at a convex mirror but in the absence of the mirror the beam converges to a point $0.2 m$ behind the mirror. The radius of curvature of the mirror is

A

20 c m

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B

50 c m

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C

66.67 c m

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D

28.57 c m

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Solution

The correct option is C $66.67 c m$
Option C is correct

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