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Article: Telescopes and lenses.
- Article from:
- Science Weekly
- Article date:
- February 14, 2005
CopyrightCOPYRIGHT 2005 Science Weekly, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Background
Lenses Physics
When we talk about lenses, we need to talk about light. Light is a form of electromagnetic energy made of tiny particles called photons. Light travels in all directions, and always travels away from its source in perfectly straight lines called rays. We see things around us because light rays bounce (or reflect) off objects. The rays pass through our pupils to the retina at the back of the eye. The retina is connected to the eye's optic nerve, which sends information about the image to the brain.
Lenses are transparent pieces of glass or plastic that bend light rays before they reach our eyes. By bending (or ...
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