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+clear
+//
+//
+//
+
+//Variable declaration
+d=0.2*10**-3 //distance between slits(m)
+lamda=550*10**-9 //wavelength(m)
+D=1 //distance of screen from slits(m)
+
+//Calculation
+beta1=lamda*D/d //fringe width(m)
+
+//Result
+printf("\n fringe width is %0.3f mm",beta1*10**3)