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// Scilab Code Ex1.20:: Page-2.16 (2009)
clc; clear;
y1 = 40; // Distance between biprism from the slit, cm
D = 160; // Distance between slit and the screen, cm
mu = 1.52; // Refractive index of material of the prism
lambda = 5893e-008; // Wavelength of light used, cm
b = 0.01; // Fringe width, cm
// As b = lambda*D/d, solving for d
d = lambda*D/b; // Distance between virtual sources, cm
// But d = 2*y1*(mu-1)*alpha, solving for alpha
alpha = d/(2*y1*(mu-1))*180/%pi; // Angle of biprism, degrees
theta = 180-2*alpha; // Angle of vertex of biprism, degrees
printf("\nThe angle of vertex of biprism = %5.1f degree", theta);
// Result
// The angle of vertex of biprism = 177.4 degree
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