Fermat's principle in optics Light from a source A is reflected by a plane mirror to a receiver at point B, as shown in the ac- companying figure. Show that for the light to obey Fermat's prin- ciple, the angle of incidence must equal the angle of reflection, both measured from the line normal to the reflecting surface. (This result can also be derived without calculus. There is a purely geo- metric argument, which you may prefer.) Normal Light receiver Light source Angle of reflection Angle of incidence 02 Plane mirror

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