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+// Scilab Code Ex2.36:: Page-2.27 (2009)
+clc; clear;
+t = 4.5e-05;    // Thickness of the soap film, cm
+mu = 1.33;      // Refractive index of the soap film
+i = 45;     // Angle of incidence of the light ray on the soap film, degrees
+// As mu = sind(i)/sind(r), solving for r
+r = asind(sind(i)/mu);
+// For dark fringe in reflected pattern,
+// 2*mu*t*cosd(r) = n*lambda, solving for lambda for different n's
+lambda = zeros(4);  
+for n = 1:1:4
+    lambda(n) = 2*mu*t*cosd(r)/n;     // Wavelengths for n = 1, 2, 3 and 4
+    if lambda(n) > 4000e-008 & lambda(n) < 7500e-008 then
+        lambda_absent = lambda(n);
+    end
+end
+printf("\nThe absent wavelength of reflected light in the visible spectrum = %4.2e", lambda_absent);
+
+// Result
+// The absent wavelength of reflected light in the visible spectrum = 5.07e-05