At what angle will the reflected beam turn if, without changing the direction of the incident beam, the mirror is rotated

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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