A light beam falls at an angle a = 30° onto a plane-parallel glass plate of thickness d = 10 cm. Determine the displacement of the beam by the plate if it is immersed: in carbon disulfide; in water. The refractive indices of carbon disulfide, glass and water are n1 = 1.6, n2 = 1.5 and n3 = 1.3, respectively.
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