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//Chapter-1,Example 1_7,Page 1-19
clc()
//Given Data:
i=30*%pi/180 //angle of incidence
u=1.43 //Refractive index of a soap film
lam=6*10^-7 //wavelength of light
n=1 //For minimum thickness
//Calculations:
//u=sin i/sin r //Snell's law .So,
r=asin(sin(i)/u) //angle of reflection
//Now, condition of minima in transmitted system is
//2ut*cos r=(2n-1)lam/2
t=lam/(2*2*u*cos(r)) //minimum thickness of film
printf('Minimum thickness of film is =%.9f m',t)
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