Lesson: Convex Lenses Physics • 9th Grade

In this lesson, we will learn how to define a convex lens, describe the paths of light rays refracted through these lenses, and explain how rays are focused by such lenses.

Lesson Video

Sample Question Videos

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Lesson Worksheet

Q1:

Which of the objects shown in the diagram is a convex lens?

Q2:

Light rays diverging from a point are incident on a convex lens, as shown in the diagram. Which of the other diagrams, (A), (B), (C), and (D), most correctly shows the directions of the rays that exit the lens?

Q3:

Part of a convex lens is shown. No light rays pass through the lens, but several possible lines normal to the surface of the lens are shown.

Which line on the left-hand side of the lens is normal to the surface at the point that the line contacts the surface?

Which line on the right-hand side of the lens is normal to the surface at the point that the line contacts the surface?