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clear
//
//
//
//Variable declaration
lamda=0.82 //wavelength(m)
theta=75.86*%pi/180 //glancing angle(radian)
n=1 //order
a=3 //lattice constant(angstrom)
//Calculation
d=n*lamda/(2*sin(theta)) //space of reflecting plane(angstrom)
//here the value of d comes to 0.422 angstrom which is not equal to the value of a. hence the problem cannot be solved further
//Result
printf("\n space of reflecting plane is %0.2f angstrom",d)
printf("\n answer given in the book is wrong")
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