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clear
//
//
//
//Variable declaration
lamdaB=0.92; //wavelength(angstrom)
theta1=30; //glancing angle(degree)
theta2=60; //glancing angle(degree)
//Calculation
theta1=theta1*%pi/180; //angle(radian)
theta2=theta2*%pi/180; //angle(radian)
lamdaA=2*lamdaB*sin(theta1)/sin(theta1); //wavelength of line A(angstrom)
//Result
printf("\n wavelength is %0.3f angstrom",lamdaA)
printf("\n answer in the book is wrong")
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