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//chapter9,Example9_5,pg 238
//for line A-> 2*d*sin(thetaA)=lamA(n=1)
thetaA=30*(%pi/180)//glancing angle for line A
//for line B-> 2*d*sin(thetaB)=3*lamB(n=3)
thetaB=60*(%pi/180)
lamB=0.97*10^-10
d=(3*lamB)/(2*sin(thetaB))
lamA=2*d*sin(thetaA)//wavelength of line A
printf("wavelength of line A\n")
disp(lamA)
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