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en.wikipedia.org/wiki/Catadioptric_system

A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric combinations are used in focusing systems such as search lights, headlamps, early lighthouse focusing systems, optical telescopes, ... Many Catadioptric telescopes use negative lenses with a reflective coating ...

www.fortworthastro.com/beginner5.html

Apr 3, 2014 ... It uses a convex glass lens (to bend light and bring it into focus. ... primary fault of refracting telescopes of Newtons day and there were many theories as to what caused it. ... A telescope that uses a combination of mirrors and lenses to ... The word catadioptric is derived by combining the term for an optical ...

science.howstuffworks.com/telescope1.htm

The reflector telescope, which uses mirrors instead of the lenses. ... An eyepiece lens takes the bright light from the focus of the objective lens or primary mirror and ... When you combine the objective lens or primary mirror with the eyepiece, you ... achieved by almost any telescope by using different eyepieces, aperture is a ...

lifeng.lamost.org/courses/astrotoday/CHAISSON/AT305/HTML/AT305EOC.HTM

Reflecting telescopes use a mirror to concentrate and focus the light. ... and hence improve its resolution, several separate instruments may be combined into a ...

imagine.gsfc.nasa.gov/science/toolbox/emspectrum_observatories1.html

Astronomers use a number of telescopes sensitive to different parts of the electromagnetic ... In addition, not all light can get through the Earth's atmosphere , so for some ... by combining Spektr-R's data with that of Earth-bound radio telescopes. ... To keep the mirror and instruments cold (and allow the telescope to detect the ...

science.nasa.gov/science-news/science-at-nasa/1999/features/ast20apr99_1

Apr 20, 1999 ... Why we need different types of telescopes to look at outer space ... By using a curved mirror to reflect and focus the light inside the tube, he was ... Mexico (right) , composed of 27 antennas electronically combined to give the ...

van.physics.illinois.edu/qa/listing.php?id=2078

Refracting telescopes use lenses to focus the light, and reflecting telescopes ... by combining both lenses and mirrors, but there are so many different ways of ...

www.ebay.com/gds/What-Are-the-Different-Types-of-Optical-Telescopes-/10000000177629139/g.html

This is done through the use of lenses and mirrors which collect the light and ... and astronomical telescopes but is now also used for long focus camera lenses. .... telescopes are optical telescopes that combine specifically shaped mirrors and ...

www.livescience.com/48110-reflection-refraction.html

Oct 1, 2014 ... A mirror image is the result of light rays bounding off a reflective surface. ... or in the case of large telescopes, by using parabolic mirrors, which are ... Focus. In a lens with a curved surface, parallel rays bend at different angles ... These lenses are often combined with a spherical shape to produce a toric or ...