If the plate in Fig. 9.17 is glass in air, show that the amplitudes of Elr, E2r, and E3r are respectively 0.2 E0i, 0.192 E0i. and 0.008E0i where E0i is the incident amplitude. Make use of the Fresnel coefficients at normal incidence, assuming no absorption. You might repeal the calculation for a water film in air.
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