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//Chapter-1,Example 1_22,Page 1-46
clc()
//Given Data:
u=1.5 //Refractive index of a oil
lam=5.88*10^-7 //wavelength of required yellow light
n=1 //for smallest thickness
r=60*%pi/180 //angle of reflection
//Calculations:
//Now, condition for dark fringe is
//2ut*cos r=n*lam
t=n*lam/(2*u*cos(r)) //thickness of film
printf('Thickness of the film is =%.10f m',t)
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