Show that the spacing d of the fringes in the formation of a holographic grating, as shown in Figure 12-7c, is given by λ/(2 sin θ), where 2θ is the angle between the coherent beams. If the beams are argon-ion laser beams of wavelength 488 nm and the angle between beams is 120°, how many grooves per millimeter are formed in a plane emulsion (n = 1) oriented perpendicular to the fringes? What is the effect on the fringe separation d of an emulsion with a high refractive index?
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