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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:');
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