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If the angle between the plane mirror and the incident ray is 40°, what are the angles of incidence and reflection?

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If the angle between the plane mirror and the incident ray is 40°, what are the angles of incidence and reflection?

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The angle between the plane mirror and the incident ray is 40°. Therefore, the angle of incidence (i) = the angle made by the incident ray with the normal to the plane mirror = 90° – 40° = 50°. The angle of reflection, r – i – 50°.

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