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clear
//
//
//
//Variable declaration
theta1=(8+(35/60))*%pi/180 //glancing angle(radian)
lamda=0.842 //wavelength of X-rays(angstrom)
n1=1 //order
n2=3 //order
//Calculation
x=n2*lamda*sin(theta1)/(n1*lamda)
theta2=asin(x)*180/%pi //glancing angle
theta2d=int(theta2) //glancing angle(degrees)
theta2m=(theta2-theta2d)*60 //glancing angle(minutes)
//Result
printf("\n glancing angle is %0.3f degrees %0.3f minutes",theta2d,theta2m)
printf("\n answer for glancing angle in minutes given in the book is wrong")
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