Задача id13731

At what thickness is the Iceland spar plate a quarter-wave plate for light with wavelength l1 = 5880 A and can rotate the plane of polarization by 90° for light with wavelength l2 = 5740 A? The difference in refractive indices for ordinary and extraordinary rays is taken equal to 0.2 for both wavelengths. Assume that the ordinary and extraordinary rays go in the same direction.

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