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  4. If a ray of light is incident on a plane mirror at an angle of incidence of 30°, then deviation produced by mirror is

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Q. If a ray of light is incident on a plane mirror at an angle of incidence of $30^{\circ}$, then deviation produced by mirror is

Ray Optics and Optical Instruments

Solution:

image
As is clear from figure,
Angle of deviation $=\angle A'O B=180^{\circ}-60^{\circ}=120^{\circ}$