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// Scilab code Ex4.27 : Pg:167 (2008)
clc;clear;
lambda = 5890e-008; // Wavelength of light, cm
mu = 1.5; // Refractive index of oil
i = 30; // Angle of incidence, degree
n = 8; // Order of dark band
sin_r = sind(i)/mu; // 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
t = n*lambda/(2*mu*cos_r); // The thickness of the oil film, cm
printf("\nThe thickness of the oil film = %5.3e cm", t);
// Result
// The thickness of the oil film = 1.666e-004 cm
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