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+clc;clear;
+//Example 8.3
+//calculation of birefringence
+
+//given values
+
+l=6*10^-7;//wavelength of light in metre
+d=3*10^-5;//thickness of crystal
+
+
+ //calculation
+ x=l/(4*d);
+disp(x,'the birefringance of the crystal is');
+\ No newline at end of file