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+// Scilab code Ex4.29 : Pg:168 (2008)
+clc;clear;
+lambda1 = 4e-005;    // First wavelength, cm
+lambda2 = 7e-005;    // Second wavelength, cm
+t = 0.001;    // The thickness of the air film, cm
+mu = 1;    // Refractive index of the air film
+i = 30;    // Angle of incidence, degree
+// As mu = sin_i/sin_r = 1, so that sin_i = sin_r 
+sin_r = sind(30);    // Sine of angle of reflection from Snell's Law, degree
+cos_r = sqrt(1-sin_r^2);    // Cosine of angle of reflection from the trigonometric identity, degree
+n1 = 2*mu*t*cos_r/lambda1;    // Number of dark bands seen at first wavelength
+n2 = 2*mu*t*cos_r/lambda2;    // Number of dark bands seen at second wavelength
+n = n1 - n2;    // Number of dark bands observed within the given spectral range
+printf("\nThe number of dark bands observed within the given spectral range = %2d", ceil(n));
+
+// Result 
+// The number of dark bands observed within the given spectral range = 19
+\ No newline at end of file