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//
//
//
//Variable declaration
theta=10*%pi/180 //angle(radian)
dtheta=3*%pi/(60*60*180) //difference of angle(radian)
dlamda=5*10**-9 //wavelength(cm)
k=2
//Calculation
lamda=sin(theta)*dlamda/(cos(theta)*dtheta)
lamdanew=lamda+dlamda //wavelength of lines(cm)
N=lamda/(dlamda*k)
Ne=N*k*lamda/sin(theta) //minimum grating width required(cm)
//Result
printf("\n wavelength of lines is %0.1f *10**-8 cm",lamda*10**8)
printf("\n answer given in the book varies due to rounding off errors")
printf("\n minimum grating width required is %0.1f cm",Ne)
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