Diffraction

  • OP1.1 Cornell Slit Plates

    These are used for viewing straight filament lamps. Placing the slit plate up to the eye will produce interference and diffraction patterns in the eye. There is a light source in the shelf as well.

  • OP1.2 Fresnel Zone Plates and Newton's Rings

    Also with these are plates with holes. Using a laser, one can show the circular diffraction of these items.

  • OP1.3 Diffraction Grating

    This is a grating of 600 lines/mm. Holding this in front of the eye while viewing a Mercury lamp will enable the viewer to see the spectrum of mercury. The lamp has an internally filters out the harmful ultraviolet rays.

  • OP1.4 Single Slit Diffraction with Laser

    The screen that runs diagonally from the back wall to the first pillar on the north side of the lecture hall should be used. The laser is placed on a rolling table on the south side of the lecture hall, leveled by lab jacks. The slit plate is placed on an optical bench. The room lights must be turned off to see the diffraction pattern on the screen. The pattern seen on the screen is the intensity of the constructive and destructive waves. The best pattern consists of approximately five intensity peaks.