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clc
//
//
//
//Variable declaration
mu=1.4 //Refractive index
cosr=0.8631
t=0.01*10**-3 //thickness
lambda1=4000*10**-10 //Wavelength 1
lambda2=5000*10**-10 //Wavelength 2
//Calculations
n1=(2*mu*t*cosr)/lambda1
n2=(2*mu*t*cosr)/lambda2
deln=(n1)-(n2)
//Result
printf("\n The number of dark bands seen betwween 4000 A and 5000A is %i ",deln)
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