The refractive angle of the biprism is a = 3 26. A lens was placed between a point source of monochromatic light (l = 5000 A) and the biprism in such a way that the width of the interference fringes turned out to be independent of the distance from the screen to the biprism. Find the distance between adjacent dark stripes if the refractive index of the biprism glass is n = 1.5. Find the maximum number of bands N that can be observed in this installation if it is obtained when the screen is removed from the biprism by L = 5 m.

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