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If the angle between the mirror and reflected ray is 23°, what is the angle of incidence of the incident ray?

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If the angle between the mirror and reflected ray is 23°, what is the angle of incidence of the incident ray?

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The angle between the mirror and the reflected ray is 23°. Therefore, the angle of reflection (r) = the angle made by the reflected ray with the normal to the plane mirror = 90° – 23° = 67°. 

∴ The angle of incidence, i = r = 67°.

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