Problem

Problem

A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angles to the plane of mirror by 20∘20^\circ the angle between the incident ray and new reflected ray is 45∘45^\circ. The angle between the incident ray and original reflected ray was therefore a. 35∘35^\circ or 50∘50^\circ b. 25∘25^\circ or 65∘65^\circ c. 45∘45^\circ or 5∘5^\circ d. None of these

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