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+// Scilab code Ex4.19 : Pg:158 (2008)

+clc;clear;

+x1 = 100;    // Position of eye-piece, cm

+x2 = 67;     // Position of first lens, cm

+x3 = 34;     // Position of second lens, cm

+v1 = x1 - x2;    // Distance between eye-piece and the second position of the lens, cm

+u = v1;    

+x = x3 - u;    // The reading of the slit on the bench, cm

+D = x1 - x;    // The distance between the focal plane of the eye-piece and the plane of the interfering sources, cm

+d1 = 0.12;    // Position of the first lens placed between the biprism and the eye-piece, cm

+d2 = 0.03;    // Position of the second lens placed between the biprism and the eye-piece, cm

+omega = 0.972/10;    // Fringe width, cm

+d = sqrt(d1*d2)/2;    // Separation between two virtual sources, cm

+Lambda = 2*d*omega/D;    // Wavelength of light used, cm

+printf("\nThe distance between the focal plane of the eye-piece and the plane of the interfering sources = %2d cm", D);

+printf("\nThe wavelength of light used = %5.3e cm", Lambda);

+

+// Result 

+// The distance between the focal plane of the eye-piece and the plane of the interfering sources = 99 cm

+// The wavelength of light used = 5.891e-005 cm 
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