At what angle will the reflected beam turn if, without changing the direction of the incident beam, the mirror is rotated by an angle φ = 10 ° relative to the axis perpendicular to the incident beam?
In this case, the angle of incidence will change by 10 °, which means the angle of reflection will also change by 10 °. This means that the angle between the incident and reflected rays will change by 20 °. This means that the reflected beam will rotate 20 °.
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