Cuemath
Cuemath: Convex Shapes
A comprehensive guide for learning all about convex shapes with definitions, examples, and practice questions.
Optical Society
Optical Society of America: Optics for Kids: Shimmering Lenses
An experiment using Jell-O to create lenses, to see how light behaves with flat, concave, and convex lens surfaces. With an explanation of what is observed, and a link to an informative article on lenses.
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