You need special optics to focus infra-red.
The longer wavelengths do not focus at the same point (they are bent less by refraction).
Mirror optics are better.
Radio telescopes, refracting telescopes, and reflecting telescopes all use mirrors or lenses to collect and focus incoming electromagnetic radiation. The main difference is the wavelength of the radiation they are designed to study – radio telescopes focus on radio waves, refracting telescopes focus on visible light, and reflecting telescopes focus on a variety of wavelengths including visible light, ultraviolet, and infrared.
nothing Anything that is transparent will have a refractive index. Glass is transparent to visible light and has a refractive index with it. Having these combined properties lets you make a lens for visible light out of glass. Now glass is transparent to IR radiation so any glass lens would focus IR radiation.
Yes a telescope collects electromagnetic radiation (light) an then brings this light to a focus so that the source of the light is magnified. The larger the diameter of the telescope, the more light it collects making the image at the focus brighter so as well as magnifying the image a telescope also allows one to see fainter objects.
An optical telescope focuses and concentrates visible light; radio telescopes focus and concentrate electromagnetic radiation (which means, "light") in the radio part of the spectrum.
An artificial telescope refers to a telescope that is man-made and not naturally occurring. They are designed to collect and focus light from distant objects for observation and study. Artificial telescopes can be found in various forms, including optical, radio, x-ray, and infrared telescopes.
Visible light is about 350-700 nm, so infrared radiation would have a wavelengt above 700 nm (0.7 microns), approximately. It is not a single wavelength, but a wide range of wavelengths. The upper range is about 300 microns. Wavelengths above that are called microwaves.
it gather electro magnetic radiation from object in space and concern trites it for better observation
All telescopes collect or focus radiation in some way, because visible light is a form of electromagnetic radiation. The advantages of telescopes include being able to see things that are far away, as well as the ability to observe heavenly bodies.
A telescope with achromatic lenses.
Newtonian telescope
It is called a refracting telescope.
The Hubble Telescope uses both mirrors and lenses to focus on images.