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clear
//
//
//
//Variable declaration
lamda=97 //wavelength(pm)
n1=1 //order
n2=3 //order
theta1=23*%pi/180 //glancing angle(radian)
theta2=60*%pi/180 //glancing angle(radian)
//Calculation
lamda1=n2*lamda*sin(theta1)/(n1*sin(theta2)) //wavelength(pm)
d=n2*lamda/(2*sin(theta2)) //interplanar spacing(pm)
//Result
printf("\n wavelength is %0.1f pm",lamda1)
printf("\n interplanar spacing is %0.0f pm",d)
printf("\n answer for wavelength given in the book varies due to rounding off errors")
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