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+clc;clear;
+//Example 7.1
+//plane parallel thin film
+
+//given values
+x=5890*10^-10;//wavelength of light in metre
+n=1.5;//refractive index
+r=60*%pi/180;//angle of refraction in degree
+ //calculation
+t=x/(2*n*cos(r));
+disp(t*10^6,'thickness of plate (in micrometre) is:');
+\ No newline at end of file