This item is an interactive Java simulation in which users control a slider to produce concave or convex lens surfaces and explore how the lens shape affects light refraction.

This page is the full index of materials by the same authors on Light and Color.  It contains tutorials on electromagnetic radiation, properties of light, reflection, refraction, diffraction, human vision, light filtration, and polarization of light.  It also links to more than 25 related Java simulations.

This is an interactive Java simulation that depicts the action of bi-convex lens magnification.