(a) In the Fresnel’s biprism arrangement, show that d = 2 (n –1) aαwhere a represents the distance from the source to the base of the prism (see Fig. 14.19), α is the angle of the biprism and n the refractive index of the material of the biprism.
(b) In a typical biprism arrangement b/a = 20 and for sodium light (λ = 5893 Å) one obtains a fringe width of 0.1 cm; here b is the distance between the biprism and the screen. Assuming n = 1.5, calculate the angle α.
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