How would I draw the sketch for part b? I have included the correct answers as a picture for this question, but I do not understand how to draw the sketch for part b. A Fresnel biprism of refractive index n and small equal base angle a is constructed as shown in the figurebelow.(a) A ray of light incident from the left normal to the base of the prism may enter eitherthe upper or lower half. Obtain the angular deviation 0 for the two cases. Assume asmall. Draw and label a sketch.(b) A plane wave is incident normal to the base of the prism, illuminating the entireprism. Fringes are observed in the transmitted light falling on a screen parallel to thebase of the prism. What is the origin of these fringes? Obtain an expression for thefringe separation in terms of the angle of deviation 0 of an incident ray. Draw and labela sketch.na(c) With a glass (n=1.5) biprism in yellow light (~600nm) a fringe separation of 100um is observed. Estimate in degrees the base angles a of the prism. Indicate and justifyyour choice of refractive index and wavelength of yellow light. (UC, Berkeley)Fig. 2.10Fig. 2.11Solution:(a) A beam of light incident normal on the base undergoes refractionat the side surfaces. A ray of light emerging from the upper half of theprism travels obliquely downwards, and by symmetry, one from the lowerhalf travels obliquely upwards, as shown in Fig. 2.11. The magnitudes ofthe angular deviation for the two cases are the same, being given for smalla by0 = (n – 1)a.(b) The two parallel beams of light emerging symmetrically from theupper and lower halves of the prism meet and interfere with each other andinterference fringes along the z axis appear on the screen. The spacing ofthe fringes is given byAy =2 sin 8202(n – 1)a(c) For yellow light of A =n = 1.5, Ay :6000 À and biprism of index of refraction100um gives a = 6 x 10-3 rad = 21'.

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