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+//Example number 2.3, Page number 2.33
+
+
+clc;clear;close
+
+// Variable declaration
+d=1*10**-3 // in m
+lamda=6000*10**-10 // in m
+nd=0.01                  // difference between the refractive indices(n1 - n2)
+
+// Calculation
+phi=(2*%pi*d*nd)/lamda // radian
+
+// Result
+printf("phi=%.1f radian",phi)
+printf("\n\nSince the phase difference should be with in 2pi radius, we get phi=4.169 rad.")