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Homework Statement
In a Young's double slit-type experiment using light of 600 nm with 0.5 mm between fringes, a thin plate of glass (d = 100 micrometers, n =1.5) is placed over one of the slits. What is the lateral fringe displacement on the screen?
2. The attempt at a solution
To be entirely honest, I really have no idea how to even start approaching this problem. I can see that obviously there will be *something* involving optical path length in there (the plate clearly increases it), but I have no real idea of what equations will be involved or how to go about doing anything.