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//Variable declaration
lamda=500*10**-9; //wavelength(m)
D=2; //diameter(m)
beta=(5/100)*10**-2; //fringe width(m)
//Calculation
d=lamda*D/beta; //separation between slits(m)
//Result
printf('separation between slits is %0.3f mm \n',int(d*10**3))
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