Answer to Question #19902 in Optics for Kay

Question

In a Young's double slit experiment a laser of wavelength 600 nm is used to obtain a pattern with a distance between the center bright fringe and the first bright fring of 0.5 mm. A thin plate of glass (thickness of 100 micrometers and refractive index of 1.5) is then placed over one of the slits. What is the lateral displacement of the central fringe on the screen?