The law of reflection

Construct a point B*, under the mirror, such that BC = B*C, as seen in Figure 2.2. Let the ray be reflected at some point, X, at the mirror.

No matter which point X we choose, XB = XB* and the journey from A^X^B is the same length as that from A^X^B*, no

Figure 2.2 This construction shows that the law of reflection follows from Fermat's law.

Figure 2.2 This construction shows that the law of reflection follows from Fermat's law.

incident light

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