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clear
//
//
//
//Variable declaration
n=2 //order
N=4250 //grating lines(lines/cm)
theta=30*%pi/180 //angle(radian)
//Calculation
e=1/N
lamda=e*sin(theta)*10**8/n //wavelength of spectral line(angstrom)
//Result
printf("\n wavelength of spectral line is %0.0f angstrom",lamda)
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