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"double refraction of light"
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A brief description of how Christmas Lights work from HowStuffWorks.com.
Applet in two parts - the first a fish's view from under water. In the second the position of the cursor is the source of a light ray. Its path from within the water to an observer appears.
This colourful ray diagram shows the dispersion of white light by an equilateral triangle prism according to Snell's law. The angle of incidence and width of beam are variable.
An animated wave diagram showing how an incident wave is refracted for a variety of angles of incidence, and a variety of materials.
A Marvin and Milo activity about light, refraction and lenses. All you need is sticky tape, water, teaspoon and some clear plastic.
A java applet that lets you investigate reflection and refraction. One of a series of simple applets that are good for display use in the classroom.
Just how realistic is it to try and use lighting as a source of power.
An experiment in mixing different coloured lights.
The light tour will let you discover information about light in the universe and how astronomers make use of light wavelengths.
A summarised view of how the aurora is formed.
Showing 21 - 30 of 285