A refracting telescope uses a lens (or for most refractors today, 2 or more lenses) to bend the wavelengths of visible light to a focal point as a means of collecting light. The light is then focused using an eyepiece. Depending on the focal length of the eyepiece, the effective magnification of a telescope can be altered.
To keep it simple: The width of the objective lens. Consider the pupil in your eye. When it is open to it's maximum (in the dark) it is still a small disc. And you can gather a large amount of light with that alone. Now compare your pupil to a telescope lens xxx wide. It can gather thousands of times more light than the pupil of your eye.
They are focused by the light rays reflecting into the lens showing the thing.
This is not a true statement
optical telescopes.
Parabolic Mirror
A concave mirror.
They all collect and focus light and other forms of electromagnetic radation.
Reflecting Telescopes -uses a single or combination of curved mirrors to bring light to a focus and make an image.
reflecting telescope gathers light from mirror
A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point. A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses). For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope. Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.
Hi , A reflective scope uses mirrors to focus the image and the light while a refractive scope uses curved glass lenses to focus the light and the image. Generally the reflector telescope is better for deep sky viewing and the refractor is better for lunar and planetary viewing. You can also find a compound telescope which uses both glass and mirrors which is better for general viewing. This site very good for info and purchase http://www.tejraj.com/index.html Contact Me: http://notesonline.co.in/mail.asp
A reflecting telescope forms an image by using a combination of curved mirrors to focus light. It was invented as an alternative to the refracting telescope.
In front of the mirror
They all collect and focus light and other forms of electromagnetic radation.
A reflecting telescope.
Reflecting Telescopes -uses a single or combination of curved mirrors to bring light to a focus and make an image.
reflecting telescope gathers light from mirror
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
A reflecting telescope uses mirrors while refracting telescopes uses lens. The refracting telescope also had chromatic aberration and bad resolution while the reflecting telescope had none of these.
Refracting telescope: Brings light to a focus by passing it completely through a transparent glass lens.The lens must be perfect throughout, and unobstructed.Reflecting telescope: Brings light to a focus by reflecting it from the surface of a curved mirror.The surface shape must be perfect, but the mirror may be made of anything, and can be supportedby anything.
A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point. A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses). For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope. Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.
A reflecting telescope.
light obviously