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//Chapter-1,Example1_2_8,pg 1-16
V=0.2 //volume of oil
A=10^4 //area
t=V/A //Thickness of oil film
r=0 //for normal incidence
n=1 //for 1st dark band
wavelength=5.5*10^-5 //wavelength of light
u=n*wavelength/(2*t*cosd(r))
printf('\nrefractive index of oil is u = %.3f',u)
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