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Re: [Phys-l] A demo for biologists?



The thickness was probably several
microns (I have nothing to measure the thickness at home).



No! You do. place a piece of it at the end of two microscope slides so tother ends are in contact illuminate the slides w/ your LASER from far away and count the FECO.

bc



On 2009, May 15, , at 15:19, ludwik kowalski wrote:

Why didn't I see any contrast on the white wall?

My red laser pointed made a light spot (diameter about 2 cm with
three well separated diffraction fringes around it) on the white wall,
25 meters away. A microscopic slide was half-covered with a "crystal-
clean polyethylene CLINGWRAP." The thickness was probably several
microns (I have nothing to measure the thickness at home).