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Making a Plane Mirror

82. The separ...

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82. The separation between the screen and a plane mirror is 2r. An isotropic point source of light is placed exactly midway between the mirror and the screen. Assume that mirror reflects 100% of incident light. Then the ratio of illuminances on the screen with and without the mirror is A) 10 : 1 B) 2 : 1 C) 10 : 9 D) 9 : 1

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