A light ray is represented by the unit vector

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A light ray is represented by the unit vector

\mathbf{s}=\tfrac{3}{5}\,\hat{\mathbf{i}}+\tfrac{4}{5}\,\hat{\mathbf{j}}

. It strikes a plane mirror whose unit normal is

\hat{\mathbf{n}}=\hat{\mathbf{k}}

. Calculate the angle of incidence.

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