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+//Example no 1-14
+//page no. 29
+clc;
+clear;
+disp('Solution (i) is ');
+ne=1.4;//refractive index
+no=1.25;            //refractive index
+c=3*10^8;                   //in m/s
+T=2*10^-5;  //in m
+l=740;      //in nm
+t=[ne-no]*T/c;      //time difference
+printf("\n Time difference, t is %0.2f ps",t*10^12);// result
+disp('Solution (ii) is ');
+le=l/ne; 
+lo=l/no;
+fi=2*%pi*T*(1/le-1/lo)*10^9;
+printf("\n Phase difference is %0.1f rad",fi);// result
+// Answer misprinted in book
+