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A one eyed demon has a circular face of ...

A one eyed demon has a circular face of radius `a_(0) = 10 cm`. The eye is located at the centre of the face. At what distance from his face he must hold a convex mirror of 5 cm aperture diameter so as to see his complete face? Focal length of the mirror is 10 cm.

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The correct Answer is:
20 cm
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