eBook
Physics Classroom

The Physics Classroom: Refraction and the Ray Model of Light

For Students 9th - 10th
Six complete lessons on refraction and the ray model of light. Tutorials include informational text, interactive activities, animations, and quick, interactive comprehension checks along the way.
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Khan Academy

Khan Academy: Converging and Diverging Lenses in a Lab

For Students 9th - 10th
This passage will test your knowledge on lenses.