Abstract
The experimental arrangement of a previous note (see ibid., vol.23, p.306 (1988) and see Phys. Teach. vol.26, p.157 (1988)) can be used for displaying diffraction patterns on a TV monitor. The relevant apparatus is shown and latex microspheres, available from scientific supply houses, are projected with a microscope onto a TV monitor. One drop of the latex concentrate is diluted with 25-50 ml of H2O. The cavity of a depression slide is filled with the suspension. A cover glass is placed over the cavity, the excess liquid wiped off and the edges of the cover seated with nail polish. The lens of the TV camera is removed and replaced with a 10-15 cm metal or cardboard tube. The eyepiece of the microscope is also removed. With a 20× objective and a 50-60 cm distance between the bottom of the camera and the microscope stage, the image diameters of the microspheres on the monitor screen are 1-2 cm in diameter. The Fresnel diffraction bands around 1.1 μm latex microspheres are shown.
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