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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
+\ No newline at end of file