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A plane mirror of circular shape with ra...

A plane mirror of circular shape with radius `r=20cm` is fixed to the ceiling .A bulb is to be placed on the axis of the mirror.A circular area of radius `R=1m` on the floor is to be illuminated after reflection of light from the mirror. The height of the room is `3m` What is maximum distance from the center of the mirror and the bulb so that the required area is illuminated?

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The correct Answer is:
75 cm
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PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Unsolved Numerical Problems
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