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clear
//
//
//
//Variable declaration
lamda=500*10**-9 //wavelength(m)
D=2 //distance of screen from slits(m)
l=5*10**-2 //distance(m)
n=100 //number of fringes
//Calculation
beta1=l/n
d=lamda*D/beta1 //distance between slits(m)
//Result
printf("\n distance between slits is %0.0f mm",d*10**3)
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