Determine the slit width that produces a diffraction pattern with the 2nd dark fringe at 6.2nm from the central fringe. The screen distance is 1.25m and the light wavelength is 600nm.

Determine the index of refraction of glass that is struck by unpolarized light at 53.8 degrees and resulting in a fully polarized reflected beam (Brewster Angle).

What is the ratio of slit separation to wavelength for a 3rd order fringe that is located at 12 degree angle?