According to the Law of Reflection, the angle of incidence equals the angle of reflection, and the incident ray, the reflected ray, and the normal to the mirror surface all lie in the same plane. When the mirror is rotated by angle ?, the normal to the mirror also rotates by ?. If the incident ray remains fixed, the angle of incidence changes. The geometry of reflection shows that the change in the angle of reflection causes the reflected ray to rotate by double the angle of the mirror's rotation relative to its initial direction.
When a mirror is rotated by an angle of 6, the reflected ray will rotate by
Asked in UPPCS Prelims 1996 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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