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Physics: Light

These sites are about visible light and the color spectrum. Learn the basic concepts of color theory including the color wheel, additive and subtractive colors, reflection, and refraction. Try the online color blindness test. There is also information about the speed of light and how the eye works.


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This site has interesting trivia about color.
Are blue M&M's your favorite? Read to find out why this color isn't a popular choice for food.
This interactive site challenges you to try to mix the three primary colors of light (red, blue, green) to match a specific color.
This site includes two color illusions. Stare at the objects, then stare at the blank space and find out what you will see.
Take an interactive test to see if you react faster to sights or sounds. This is a fun activity for the SMARTboard.
This company's Web site includes some fun interactive games that test your knowledge about hue, saturation, additive and subtractive colors, and the color cube.
This page explains how a prism works and shows the difference between colors made from light and colors used for printing. Roll your mouse over the images to see changes.
This article discusses key concepts of color theory: hue, saturation, chroma, and value. Click on the cubes to see them enlarged.
This interactive activity lets you drag filters over different colored light to see the changes that occur.
This interactive site shows how light is reflected. Manipulate the wavelength and angle to change the reflected light.
Moire patterns occur in print when printing plates aren't aligned. Play with these interactive images and see how moire patterns can be used in illusions.
Take this color blindness test to see if you can distinguish between the colors.
This site provides brief answers to common questions about color blindness.
Learn how fast light travels and choose which objects can slow it down.
Try these activities about light, color, and mirrors.
Wait for the ad to finish loading, then watch this movie about vision. Includes a quiz. Click on "Experiment with Bob" to try an easy eye experiment.
Move the images on top of each other to see how the different colored images combine to make a printed photograph.
This site from Brazil is about color, its characteristics, and meaning. There is information on vision, chromotherapy, and chromatic illusions.

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