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+clc
+// Given That
+lambda1 = 5.9e-5 // wavelength in cm
+lambda2 = 5.896e-5 //wavelength in cm
+lambda = 5.89e-5 // wavelength in cm
+grating_element = 4000 // lines per cm
+t = 4 // width of grating in  cm
+n = 1 // for first order spectrum
+//Sample Problem 27 Page No. 58
+printf("\n # Problem 27 # \n")
+printf(" \n Standard formula used \n   lambda / d_lambda = n*N”)\n")
+
+N = t * grating_element
+ Resolv_pow = lambda /(lambda2 - lambda)
+ N = Resolv_pow / n
+ 
+ if (grating_element > N  )  then 
+     printf("Grating will well resolve two spectral lines. \n") 
+     end
+