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The separation between the screen and a ...

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 is

A

`10 : 1`

B

`2 : 1`

C

`10 : 9`

D

`9 : 1`

Text Solution

Verified by Experts

The correct Answer is:
c
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