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//Chapter-1,Example1_2_1,pg 1-11
i=45 //angle of incidence
u=1.2 //refractive index of soap film
t=4*10^-5 //thickness of soap film
r=asind(sind(i)/u) //by Snell's law
//for dark band '2*u*t*cos(r) = n*lam'
wavelength_1=(2*u*t*cosd(r)/1)*10^8 //for n=1
wavelength_2=(2*u*t*cosd(r)/2)*10^8 //for n=2
wavelength_3=(2*u*t*cosd(r)/3)*10^8 //for n=3
//visible range of wavelengths is 4000 A. to 7000 A.
printf('\n for n=1 wavelength = %.1f A.\n',wavelength_1)
printf('\n for n=2 wavelength = %.1f A.\n',wavelength_2)
printf('\n for n=3 wavelength = %.2f A.\n',wavelength_3)
printf('\n hence, none of the wavelengths from the visible region are absent in reflected light ')
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