# Title Image Description Video
1 Single Slit and Laser

​Diffraction Through One Slit

Turn on the laser. The pattern appears on the wall. The slit widths are printed on the slide. To select a different slit, slide the holder sideways. We also have the Cornell slitfilm card, which includes a slit of gradually increasing width.

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2 Double Slits and Laser

Interference From Two Sources

Turn on the laser. The pattern appears on the wall. The slit widths and spacings are printed on the slide. To select different slits, slide the holder sideways. We also have the Cornell slitfilm card, which includes double slits of increasing width and spacing.

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3 Number of Slits Gratings

Turn on the laser and place the slit slide in front of the beam so the beam hits one of the many slits on the slide. View the results of the interference pattern on the wall. The lights in the room may need to be darkened.

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4 Michelson Interferometer

Interferometers

Turn on the laser. Read the initial position of the micrometer. Count the number of fringes while turning the micrometer slowly in one direction only. Read the final position. This can also be done with white light.

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5 Polaroids on the Overhead

Dichroic Polarization

You get two sheets of Polaroid and a pair of Polaroid sunglasses. Rotate one on the Polaroids or the sunglasses.

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6 Microwave Polarization

Dichroic Polariztion

Hold a grid of parallel wires in a microwave beam and rotate the grid.

 
7 Brewster's Angle

Polarization by Reflection

Light is reflected from a sheet of black glass onto the wall. Rotate a sheet of Polaroid in the path of the reflected light. We set the light at Brewster's Angle. Vary the incident angle by rotating the light. A metal triangle can be used to set the incident light back to Brewster's Angle.  
8 Three Polaroids

Circular Polarization

Three sheets of Polaroids are provided with an overhead projector.

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9 Karo Syrup

Circular Polarization

Place the Karo syrup between the disks. Place the light source behind the rear polarizer disk and turn the lamp on. Rotate the front disk and watch the syrup change colors.

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