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// Scilab Code Ex4.7 : Page-93 (2010)
w = 5; // Width of the grating, cm
N = 320; // Number of lines per cm on grating, per cm
N0 = w*N; // Total number of lines on the grating
lambda = 640; // Wavelength of light, nm
n = 2; // Order of diffraction
d_lambda = lambda/(n*N0); // Separation between wavelengths which the gratign can just resolve, nm
printf("\nThe separation between wavelengths which the grating can just resolve = %3.1f nm", d_lambda);
// Result
// The separation between wavelengths which the grating can just resolve = 0.2 nm
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