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+clc;clear;
+//Example 8.2
+//Polarizer,calculation of angle
+
+//given values
+Io=1;//intensity of polarised light
+I1=Io/2;//intensity of beam polarised by first by first polariser
+I2=Io/3;//intensity of light polarised by second polariser
+
+
+ //calculation
+a=acos(sqrt(I2/I1));
+alpha=a*180/%pi;//conversion of angle into degree
+disp(alpha,'angle between characteristic directions  (in degree) is');
+\ No newline at end of file