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//Chapter-1,Example 1_11,Page 1-22
clc()
//Given Data:
i=asin(4/5) //angle of incidence
u=4/3 //Refractive index of a soap film
lam1=6.1*10^-7 //wavelength of light
lam2=6*10^-7 //wavelength of light
//Calculations:
//u=sin i/sin r //Snell's law .So,
r=asin(sin(i)/u) //angle of reflection
//Now, condition for dark band is
//2ut*cos r=n*lam
//for consecutive bands, n=lam2/(lam1-lam2). hence
t=lam2*lam1/((lam1-lam2)*2*u*sqrt(1-(sin(i)/u)^2)) //thickness of film
printf('Thickness of the film is =%.7f m',t)
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