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clc;
clear;
theta=10 //angle in degree
d_theta=3 //angle in degree
d_lambda=5*10^-9 //wavelength in cm
k=2
//calculation
lambda=(sind(theta)*d_lambda)/(cosd(theta)*(d_theta/(60*60))*(%pi/180)) // wavelength in cm
N=lambda/(d_lambda*k) //number of lines
Ne = (N*k*lambda)/sind(theta)
printf("Minimum grating width required = %1.1f cm",Ne)
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