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//Chapter-1,Example1_2_6,pg 1-15
n=8
wavelength=5890*10^-8 //wavelength of light
u=1.46 //refractive index of oil
i=30 //angle of incidence
r=asind(sind(i)/u) //by Snell's law
t=n*wavelength/(2*u*cosd(r))
printf("\n the thickness of an oil film is t =%.7f cm",t)
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