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clear
//
//
//
//Variable declaration
d=2.81; //lattice spacing(angstrom)
theta1=15.1; //glancing angle(degree)
theta2=17.1; //glancing angle(degree)
//Calculation
theta1=theta1*%pi/180; //angle(radian)
lamda1=2*d*sin(theta1); //wavelength(angstrom)
theta2=theta2*%pi/180; //angle(radian)
lamda2=2*d*sin(theta2); //wavelength(angstrom)
//Result
printf("\n wavelengths are %0.3f angstrom and %0.4f angstrom",lamda1,lamda2)
printf("\n answer varies due to rounding off errors")
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