Laurence, Lionel · London, School of Optics · leaf 206
rism it takes up the position C M, r being theangle of refraction. Since the deviation is supposed to be minimum, the total refraction issymmetrical with respect to the surfaces C B and C D, so that C M bisectsthe principal angle. The wave is then incident on the second surface at theangle u, and… … Fig. 211a. Reflection.—In Fig. 211a let SS be a plane surface, and A a pointfrom which waves diverge. The latter are reflected back with theircurvature unaltered, such that they appear to originate from the virtualimage C. The distances BC and AB are equal. A ray AD incident atthe point D is…
Optics
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