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+clc
+//Given that
+D=80// separation between source and screen in cm
+d=0.18// separation between sources in cm 
+n=4// order of fringe
+x_n=1.08// distance from central bright fringe in cm
+//Sample Problem 2 Page No. 47
+printf("\n # Problem 2 # \n")    
+printf(" \n Standard formula used \n   x_n= n*lambda*D/d \n")
+
+lambda=d*x_n/(D*n)*1e7
+printf("\n Wavelength of light used is %d Angstrom.", lambda)
+
+