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Q.

You are asked to design a shaving mirror assuming that a person keeps it 10cm from his face and views the magnified image of the face at the closet comfortable distance of 25cm from the mirror. The magnitude of radius of curvature of the mirror (in cm) would then be:

(Round off to nearest integer)

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answer is 33.

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Detailed Solution

u=−10cmv=25cm1u+1v=1f

1−10+125=2R, −5+250=2R, R=100−3=−33.3cm

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