Ah, that question brings back memories of our little school lab. With your numbers, the fringe width would be about 0.6 mm if your screen is a meter away, but in our classroom, the old 100-watt bulb we used for a source never gave such clean results. The real kazarr was making those slits with a razor blade on a painted slide—my students’ hands would shake, and the fringes would be as wavy as the Mandovi river! I found more consistent patterns teaching them with two fine combs held together, a trick my own physics teacher, Mr. Naik, showed me long ago.
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