In a fixed plane, the incident-ray direction has signed angular velocity ωᵢ and the mirror normal has signed angular velocity ωₘ. What is the signed angular velocity ωᵣ of the reflected ray?
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In a fixed plane, the incident-ray direction has signed angular velocity ωᵢ and the mirror normal has signed angular velocity ωₘ. What is the signed angular velocity ωᵣ of the reflected ray?

G1 Physics · Accepted Answer

The angular reflection relation is φᵣ=2φₘ−φᵢ. Differentiating gives ωᵣ=2ωₘ−ωᵢ.