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Photometry and Geometrical Optics

Problem 5.13

Write the law of reflection of a light beam from a mirror in vector form, using the directing unit vectors e\mathbf{e} and e′\mathbf{e}^{\prime} of the incident and reflected beams and the unit vector n\mathrm{n} of the outside normal to the mirror surface.

Reveal Answer
e′=e−2(en)n\mathbf{e}^{\prime}=\mathbf{e}-2(\mathbf{e n}) \mathbf{n}
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