Observe the picture in the figure carefully.

A patch of light is obtained at B when the torch is lighted, as shown. Which of the following is kept at position A to get this patch of light?

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A wooden board

A glass sheet

A mirror

A sheet of white paper

answer is C.

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Detailed Solution

A mirror is kept at position A to get this patch of light obtained at B.
A mirror should be placed at position A can only reflect the patch of light, which can be seen on the screen using the phenomenon of reflection. The rest of the options are not the reflecting surfaces, hence cannot be placed at position A.

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