when a light ray strike with 45degree angle of reflection
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angle of incidence is measured from the normal to the mirror at the point where the ray strikes the mirror. Here the angle of incidence = 90–45 = 45
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A ray of light from O strikes a plane mirror at an angle of 45° at point P. Since from the laws of reflection the angle of incidence i is equal to the angle of reflection r then i = r = 45°. Thus angle OPQ = 90° and the light is reflected through 90°. The ray then strikes another mirror at 45° at point Q.
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