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// Scilab Code Ex3.25:: Page-3.46 (2009)
clc; clear;
lambda1 = 5500e-008; // First wavelength, cm
lambda2 = 3700e-008; // Second wavelength, cm
N = 15000; // No. of lines per inch of grating, lines/inch
a_plus_b = 2.54/N; // Grating element, cm
f = 120; // Focal length of the lens, cm
n = 1; // Order of diffraction for principal maxima
// As (a+b)*sin(theta_n) = n*lambda, solving for theta1 and theta2
theta1 = asind(n*lambda1/a_plus_b); // Direction of principal maxima with lambda1, degrees
theta2 = asind(n*lambda2/a_plus_b); // Direction of principal maxima with lambda2, degrees
// As tand(theta) = x/f, solving for x1 - x2 = dx
dx = f*(tand(theta1)-tand(theta2)); // Linear separation of two lines in first order spectrum, cm
printf("\nThe linear separation of two lines in first order spectrum = %5.2f cm", dx);
// Result
// The linear separation of two lines in first order spectrum = 14.34 cm
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