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Question

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. Torch and point 'A' are equidistant from 'C'.



At which point should the eye be placed, so that the hole can be seen?


A

D

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B

A

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C

B

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D

C

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Solution

The correct option is B

A


Law of reflection states, the angle of incidence should be equal to the angle of reflection.

The eye should be placed at A because the hole can be seen only when the angle of incidence is equal to the angle of reflection.


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