A beam of light is projected through an adjustable slit into a telescope attached to a TV camera. The central slit widens as the slit is closed. L-73 Have each student look at a vertical filament lamp through the slit formed by holding two fingers together. Look through a vernier caliper toward a monochromatic light 5 to 10 m away. Single and double lines are ruled on a photographic plate.
Students look at a line filament covered with half red and half blue filters.
A ruling tool is described. 6C10.27 Cornell plate 35-3.2 Pass out Cornell plates to the students and have them look at a line filament. O-7c Pass out the Cornell plate. 1000 6C10.30 slit array 35-3.3 A slit array of randomly spaced single or double slits follows the imaging lens projecting a slit on the wall. L-83 Focus a slit on the wall and place photographic plates with slits near the lens.