Through a narrowing slit, a light beam becomes more spread out.

Creating an interference pattern in a pool of water by tapping on the surface at two points. Also includes a slide of a butterfly in a pond.

Finding locations in the lecture hall where constructive and destructive interference occurs from two speakers placed at the front of the room.

The original experiment used to demonstrate that light was a wave, performed here by shining a red laser through two small slits.

Tracking the interference pattern from two sources of radar waves using a receiver that slides along a track.

Interference pattern for a red laser and a white light shining through a fine grating.

Using a lens to see an interference pattern at a much closer distance. Demonstration uses the lens of the eye and an individual grating to view the pattern for a white light and a neon light.

Showing that for a narrower slit the diffraction pattern becomes wider using a variable width slit and a green laser.

Testing the eye's angular resolution by looking at a series of pairs of pinholes with different separations to see which ones appear as two distinct light sources.

Definition, including the dispersion of light in a prism. Demonstration that the combination of all colors of light is white using a rotating disk.

Table of wavelengths for visible light. The primary colors of light, including a color triangle. Demonstration of creating yellow and orange light from combinations of red and green light.

A black and white top which gives the illusion of color when rotated.

Creating what appears to be a color image by superimposing two black and white images, one of which was taken with and is projected with a red filter.

Looking through two polarizers, one of which is rotating to alternately block out the polarized light and allow it to pass through.

Polarizing light by shining it at an angle off of a piece of glass.

Scattering light using cigarette smoke with small and large particles

Creating a blue sky and a red sun in the classroom by shining light through a bucket of thiosulfate.

Creating a rainbow by projecting light through a single drop of water and onto a large screen. Using a polarizer to show the polarization of the light in the rainbow.