You are teaching a class on diffraction and set up a demonstration where you shine red laser light with a wavelength of 650 nm through a double-slit onto the whiteboard in your classroom that is 1.2 m from the double-slit. The double-slit is lined up with the center of the whiteboard. You observe that the 2-meter-wide whiteboard just barely fits 3 diffraction minima on each side of the pattern (note diffraction minima do not have a width), and that the second diffraction minima appear to completely eliminate the 13th bright interference fringe. What are the slit separation and slit width of the double-slit device you All rights reserved. are using?