Quiz 9


Ch. 27



1) A thin layer (241nm) of oil (n=1.44) floats on top of water (n=1.33).  What is the largest wavelength of light (in air) that will destructively interfere?  What color will the surface appear?  





















2) 560nm light illuminates a 2500 line-per-cm diffraction grating and produces its 1st order maximum 1cm above the central maximum on a screen, which is a distance L away from the grating.     What is L?