Using a telescope set to infinity, stripes of equal inclination are observed in a thin plane-parallel plate with a thickness of h = 0.2 mm and a refractive index of n = 1.41. In this case, the viewing angle j can change from 0° to 90°. Find the maximum and minimum order of interference fringes. Estimate the permissible degree of monochromaticity Dl at which all interference fringes will be observed. What is the acceptable source size in this experiment?

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