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clc
//Given
grating_element=6000// lines per centimeter
theta=30// angle of second order spectral line in degree
n=2// order
//Sample Problem 20 Page No. 54
printf("\n # Problem 20 # \n")
printf(" \n Standard formula used \n n*lambda= (a+b)*sin(theta) \n")
lambda=sin(theta*%pi/180)/(grating_element*n)
printf(" Wavelength is %e cm.\n",lambda)
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