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A ray of light strikes a plane mirror at an angle of 40 degree to the surface of the mirror. Find the angle of deviation of the ray after reflection from the mirror
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Angle of light ray to the mirror surface =40°  

Then,

The angle of incidence = 90° - 40° = 50°

 The second law of reflection indicates that , angle of incidence is equal to the angle of reflection. So, angle of reflection = 50°
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