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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. At which point should the eye be placed, so that the hole can be seen?
$(a)$. A
$(b)$. B
$(c)$. C
$(d)$. D
As the angle of incidence is equal to the angle of reflection. So, the eye should be placed at point A.
Therefore, option $(a)$ is correct.
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