York University
York University: Color and Color Vision
York University provides an index page to several other pages on the topic of color and color vision. The pages are part of an online "book." Many graphics and explanations.
Other
Dispersion
This site discusses the range, average deviation, variance, and standard deviation, as well as their relation to dispersion.
Other
James Wright: Measures of Central Tendency
This site looks at measures of central tendency and dispersion. Discussed are topics such as standard deviation, mean, median, and mode.
United Nations
Unesco: Measures of Dispersion
Explanation of the different measures of dispersion (range, interquartile range, and standard deviation) are given.
Walter Fendt
Walter Fendt: Reflection and Refraction of Light
Defines the refraction of light and provides an applet for investigating it.
Calculator Soup
Calculator Soup: Variance Calculator
Variance is a measure of dispersion of data points from the mean. Low variance indicates that data points are generally similar and do not vary widely from the mean. High variance indicates that data values have greater variability and...
Curated OER
Dispersion
The phenomenon of light dispersion is explained with a formula and a practice form for calculating Abbe's number.