Physics Classroom
The Physics Classroom: Lesson 3: Concave Mirrors
Lesson 3 of this tutorial on refraction is on concave mirrors. Content that is covered includes the anatomy of curved mirrors, reflection of light and image formation, ray diagrams, image characteristics for concave mirrors, plus more.
Physics Classroom
The Physics Classroom: Image Formation by Lenses
This lesson explains what lenses are, the different between a converging and diverging lens, the difference between a double convex and double concave lens, and gives definitions for terms related to lenses.
CK-12 Foundation
Ck 12: Concave and Convex Lenses
[Free Registration/Login may be required to access all resource tools.] Students describe and predict image formation as a consequence of refraction through a thin convex lens.
Physics Classroom
The Physics Classroom: Refraction and the Ray Model of Light: Anatomy of a Lens
Illustrated diagrams in this tutorial help students understand the properties and functions of lenses.