Illuminate a microscope slide (or even better, a thin cover-glass slide). Colored fringes can easily be seen with an ordinary fluorescent lamp (although some of the newer versions don€™t work well at all) serving as a broad source or a mercury street light as a point source. Describe the fringes. Now rotate the glass. Does the pattern change?Duplicate the conditions shown in Figs. 9.29 and 9.30. Try it again with a sheet of plastic food wrap stretched across the top of a cup.

Fig 9.29

Fig 9.30

Pinhole Hg lamp Lens Filter E Er Ezr 2 Extended source Er E2 P1 P2 2