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clear
//
//
//
//Variable declaration
Dn=2*10**-3 //diameter of ring(m)
n=10
lamda=500*10**-9 //wavelength(m)
//Calculation
R=Dn**2/(4*n*lamda) //radius(m)
t=Dn**2/(8*R) //thickness of air film(m)
//Result
printf("\n thickness of air film is %0.3f micro m",t*10**6)
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