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// Scilab Code Ex3.30:: Page-3.49 (2009)
clc; clear;
lambda1 = 5890e-008; // Wavelength of D1 line of Na, cm
lambda2 = 5896e-008; // Wavelength of D2 line of Na, cm
d_lambda = lambda2-lambda1; // Linear separation of two lines just seen as separate, cm
P = 500; // Number of lines per cm on grating, lines/cm
n = 2; // Order of diffraction
// As resolving power of grating, lambda/d_lambda = n*N, solving for N
N = lambda1/(d_lambda*n); // No. of lines required per cm on grating, lines/cm
w = N/P; // Least width of grating, cm
printf("\nThe least width of plane transmission grating = %5.3f cm", w);
// Result
// The least width of plane transmission grating = 0.982 cm
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