Video and lesson investigations on the topic of lenses. Key concepts include:
- All lenses bend light. Convex lenses also focus light, causing magnification of objects viewed through them.
- Different curves produce different magnification.
Magnifying lenses have the effect of concentrating, or focusing light.
- A strong lens has the effect of making objects seem larger or closer when viewed through it.
- Lenses are used innumerous devices to help us to see objects more clearly such as reading glasses, distance glasses, contact lenses, microscopes, magnifiers and magnifying glasses, binoculars and telescopes.
- Lenses are also used as devises to focus light images such as photograph cameras, film and video recording cameras, film and slide, and overhead projectors.