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clear
//
//
//
//Variable declaration
lamda=5460*10**-8 //wavelength(cm)
f=400 //focal length(cm)
n=5
mew=1.5 //refractive index
//Calculation
R=2*f*(mew-1) //radius(cm)
Dn=sqrt(2*((2*n)-1)*lamda*R) //diameter of 5th fringe(cm)
//Result
printf("\n diameter of 5th fringe is %0.2f m",Dn)
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