Activity
Exploratorium

Exploratorium: Critical Angle

For Students 3rd - 8th
Students can see light reflected and refracted in this demonstration. They will also discover the total internal reflection of light.
Interactive
Other

Ntnu Virtual Physics Lab: Thick Lens Java Applet

For Students 9th - 10th
An interactive Java applet which allows the user to investigate the path of light through a lens shape object. The shape of the object, the index of refraction of the material, and the location of the incident rays can be altered.
Unit Plan
CK-12 Foundation

Ck 12: Physical Science: Refraction of Light

For Students 4th - 5th
[Free Registration/Login may be required to access all resource tools.] Discusses refraction of light in matter and how light changes its speed and angle of refraction according to the type of medium it is travelling through.
Handout
Georgia State University

Georgia State University: Hyper Physics: Reflection and Refraction

For Students 9th - 10th
Reflection and refraction are explained with an experiment that uses a sheet of paper, cardboard, and other common materials.
Interactive
Walter Fendt

Walter Fendt: Reflection and Refraction of Light

For Students 9th - 10th
Defines the refraction of light and provides an applet for investigating it.
Handout
University of St. Andrews (UK)

University of St. Andrews: Willebrord Snell

For Students 9th - 10th
A fairly short biographical sketch of Willebrord Snell (1591-1626 CE). Discusses his upbringing, education and professional life.