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//chapter8,Example8_14,pg 209
grat=1/1250//transmission grating
n=2
theta=30*(%pi/180)//deviation angle
//(a+b)sin(theta)=n*lam
//grat=(a+b)
lam=(grat*sin(theta))/n//wavelength of spectral line
printf("wavelength of spectral line\n")
printf("lam=%.6f cm",lam)
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