Observe the picture given in Fig. 11.1 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?

● Option (a) : A wooden board does not reflect the light it blocks the light because it is opaque hence we cannot see the patch of light by placing wooden board in position A. Therefore the option (a) is incorrect.

● Option (b) : A glass sheet does not reflect the light it allows light to pass through it because it is transparent hence we cannot see the patch of light by placing glass sheet in position A. Therefore the option (b) is incorrect.

● Option (c) : A mirror reflect the light and the direction of light changes when it falls on the mirror hence we can see the patch of light by placing mirror in position A. Therefore the option (c) is correct.

● Option (d) : A sheet of white paper does not reflect the light hence we cannot see the patch of light by placing wooden board in position A. Therefore the option (d) is incorrect.