Lenses
We use lenses everyday in our daily lives. Check out this video for some examples.
Diverging Lenses
A diverging (concave) lens causes parallel rays to diverge after passing through the lens. The rays appear to be coming from the focal point on the side from which the rays originate.
Ray Diagram for Concave Lenses
To see the image, you must put your eye in the path of the diverging rays. If you place your eye where the rays are still converging, you will not see the image.
For a diverging lens, the rays parallel to the PA are refracted so that they appear to be diverging from the focal point on the side of the lens where they began.
Ray Diagram for Concave Lenses
To determine the kind of image formed by a convex lens, draw light ray diagrams.
Watch this video (start at 1:05) to see ray diagrams being drawn.
Practice Answer Key:
Question of the Day #13: Draw the ray diagram and state the image characteristics (SALT).
