A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Fig. 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

Answer: (a) A

The eye should be placed at position A because the hole can be seen only when the angle of incidence is equal to the angle of reflection.

Law of reflection is defined as the principle when the light rays fall on the smooth surface, the angle of reflection is equal to the angle of incidence, also the incident ray, the reflected ray, and the normal to the surface all lie in the same plane.

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