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The separation between the screen and a plane mirror is 2 r . 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 isA. `10 : 1`B. `2 : 1`C. `10 : 9`D. `9 : 1` |
Answer» Correct Answer - c | |