Fundamentals of geometrical optics
Introduction
Figure 21
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Mirrors of optical quality are generally made of a surface of plane polished glass, convex or concave on which is disposed a reflecting coating.
A luminous ray reflecting itself on a mirror follows Descartes' second law :
If i1 eand i2 are the angles for the incident ray and for the reflected ray in relation to the normal to the surface, we have :