Learn about Webel's comprehensive SysMLv2 Workshop Seminar course!
Webel now has a SysMLv2 Online Self-Study course with self-test Quizzes!
Learn about the Webel Q&A     online self-testing system for SysML v2/v1

The Newtonian telescope ... usually has a paraboloid primary mirror but at focal ratios of f/8 or longer a spherical primary mirror can be sufficient for high visual resolution.

Icon class
icon_class
fas fa-quote-left
icon_class_computed
fas fa-quote-left
Related content
The Newtonian telescope has flat secondary mirror and a paraboloid or spherical primary mirror
Source
Wikipedia
Copyright information
Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence
Snippet kind
INFO
Keywords
Full quote
The Newtonian telescope ... usually has a paraboloid primary mirror but at focal ratios of f/8 or longer a spherical primary mirror can be sufficient for high visual resolution.
URL
https://en.wikipedia.org/wiki/Reflecting_telescope
Next snippet
Related snippets
A curved primary mirror is the reflector telescope's basic optical element that creates an image at the focal plane [OF THE PRIMARY IF THERE IS NO SECONDARY]. The distance from the mirror to the focal plane is called the focal length.
The Gregorian telescope ... employs a concave secondary mirror that reflects the image back through a hole in the primary mirror. This produces an upright image
Related snippets (backlinks)
A flat secondary mirror reflects the light to a focal plane at the side of the top of the telescope tube.
The cassegrain telescope (sometimes called the "Classic Cassegrain") ... has a parabolic primary mirror, and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary.
The Ritchey–Chrétien telescope ... is a specialized Cassegrain reflector which has two hyperbolic mirrors (instead of a parabolic primary).
It is free of coma and spherical aberration at a nearly flat focal plane if the primary and secondary curvature are properly figured.
A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. ... They are used as objectives for large reflecting telescopes.
Visit also
Visit also (backlinks)