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//Chapter-1,Example 1_5,Page 1-18
clc()
//Given Data:
t=0.2/(100)^2*10^-2 //thickness of film in meter
lam=5.5*10^-7 //wavelength of light in meter
r=0 //normal incidence
n=1 //first band
//Calculations:
//Condition for dark fringe is
//2ut*cos r =n*lam
u=n*lam/(2*t*cos(r)) //Refractive index of a oil
printf('Refractive index of a oil is =%.3f ',u)
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