m, such as air and the other two respectively. For in fig. 61let <£ be the angle of incidence at Q or Q, fa the angle of refraction at Q,fa is also the angle of incidence at E. Let <p.2 be the angle of refractioninto the second medium at R, then since QR and RT are parallel fa isthe angle of… … the refrac- Then from the definitionsin <j> _sin fa~a sin fasin fa sin fa a yHence multiplying the first two together, _ sin 0 sin fa _ sin <f>0^0 • pV-y — gjn ^ sm ^ — g-n ^ • Hence 0/J-.. = —-, OT, putting this in words, 46] REFRACTION AT PLANE SURFACES. 83 If A, B, C denote the three…
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