This virtual manipulative will allow the students to understand how does a lens form an image. Students can see how light rays are refracted by a lens. Students can recognize that the image changes when they adjust the focal length of the lens, move the object, move the lens, or move the screen. Some of the sample learning goals can be:
Explain how an image is formed by a converging lens using ray diagrams.
How changing the lens (radius, index, and diameter) effects where the image appears and ho it looks it terms of magnification, brightness and inversion.