Lens (optics): Difference between revisions
Jim.henderson (talk | changes) m Aristophanes link |
m use standard simple headings and/or general cleanup using AWB |
||
| Line 17: | Line 17: | ||
[[Galileo Galilei]] is commonly believed to have used lenses to make the first known refracting [[telescope]]. However, he merely adapted and improved a design he learned from [[Dutch people|Dutch]] lensmakers such as Hans Lippershey. He was probably the first to use telescopes to make accurate [[Astronomy|astronomical]] observations, though. |
[[Galileo Galilei]] is commonly believed to have used lenses to make the first known refracting [[telescope]]. However, he merely adapted and improved a design he learned from [[Dutch people|Dutch]] lensmakers such as Hans Lippershey. He was probably the first to use telescopes to make accurate [[Astronomy|astronomical]] observations, though. |
||
== |
==Related pages== |
||
* [[Camera lens]] |
* [[Camera lens]] |
||
* [[Focal length]] |
* [[Focal length]] |
||
Revision as of 23:44, 7 January 2015
A lens is a clear (transparent) object (like glass, plastic or even a drop of water) that changes the way things look by bending the light that goes through it. They may make things appear larger, smaller, or upside-down. Some places lenses are used include spectacles (eyeglasses), contact lenses, cameras, projectors, microscopes, telescopes, magnifying glasses, etc. Eyes are also considered lenses.
They work by refraction, or the bending of light.
Lenses have three main shapes. Each different shape changes the image (making it bigger or smaller). The three types are:
History
The word "lens" comes from the Latin word for "lentil," because the earliest convex lenses in common use were shaped like the bean.
The oldest written record of lenses is in the ancient Greek play by Aristophanes called "Clouds", where lenses were used with sunlight to make fire.
Galileo Galilei is commonly believed to have used lenses to make the first known refracting telescope. However, he merely adapted and improved a design he learned from Dutch lensmakers such as Hans Lippershey. He was probably the first to use telescopes to make accurate astronomical observations, though.
Related pages
