Question: A laser beam whose wavelength is 681 nm falls on a barrier containing a pair of very narrow slits. A screen is located 2.65 m from the slits. The ratio is 0.0160 between the intensity at a distance of 1.27 cm from the centerline, and the intensity at the peak of the central maximum.
A- What is the separation between the centers of the two slits?
I need help to solve the above question and note that in this situation, the point that lies a distance of 1.27 centimeter from the centerline still lies on the central peak. The first intensity minimum is just beyond this point.