What must be the diameter of the beam

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Reference no: EM13334176

A highly polished silver hemisphere of radius R rests with its base on a level table. A parallel beam of light with circular cross section and diameter D shines vertically down on the hemisphere. The central axis of the beam coincides with the symmetry axis of the hemisphere. What must be the diameter of the beam if light from the outer edges of the beam is reflected horizontally?

Reference no: EM13334176

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