In an experiment to observe fringes of equal inclination, the source emits wavelengths of 500 nm and 600 nm. It is observed that a bright fringe is obtained for both wavelengths when the light passes through the film at cos^-1(0.7) to the normal, and that the next such coincidence occurs at an angle cos^-1(0.8) Deduce the optical thickness of the film and the orders of the fringes for which the two coincidences occur. 今天老师出给我们的,完全不知道这题在干嘛 有人可以跟我讨论一下吗 感恩><" --

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