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//Chapter-1,Example 1_26,Page 1-48
clc()
//Given Data:
i=45*%pi/180 //angle of incidence
u=4/3 //Refractive index of soap film
lam=5*10^-7 //wavelength of light
t=1.5*10^-6 //thickness of film
//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
n=2*u*t*cos(r)/lam //order of band
printf('order of dark band is =%.1f \n',n)
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