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Q.

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

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a

A wooden board

b

A glass sheet

c

A mirror

d

A sheet of white paper

answer is C.

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Detailed Solution

A mirror is to be positioned ‘

A

’ to get this patch of light.
This is because, among all the options given, only a mirror is the material that can reflect light coming from the light source, while on the other hand, materials like a wooden board, glass sheets and a sheet of white paper don’t have the properties to reflect the light. Instead of reflecting, they absorb the light ray.

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