Observe the picture given in 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?
$(a)$. A wooden board
$(b)$. A glass sheet
$(c)$. A mirror
$(d)$. A sheet of white paper"
To obtain this patch of light, A mirror should be kept at A so that reflection can take place and the direction of light is changed through reflection.
So, option $(c)$ is correct.
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