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William Herschel the william herschel telescope was used to eliminate the small diagonal mirror from his design and titled his primary mirror so he could view the formed image directly.
The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1643-1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton’s first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope.[1] The Newtonian telescope's simple design makes them very popular with amateur telescope makers
optical telescopes An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for making a photograph, or collecting data through electronic image sensors
refracting telescope A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such as binoculars and long or telephoto camera lenses.
reflecting telescope A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image.
aerial telescope An aerial telescope is a type of very-long-focal-length refracting telescope built in the second half of the 17th century that did not use a tube
gregorian telescope The Gregorian telescope consists of two concave mirrors; the primary mirror (a concave paraboloid) collects the light and brings it to a focus before the secondary mirror (a concave ellipsoid) where it is reflected back through a hole in the centre of the primary
The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas.
dollond telescope The telescope played an important role in discovering the accelerated expansion of the Universe, and it has made important contributions in the fields of observational cosmology, gamma-ray bursts, galaxy dynamics and star evolution.
discoveries that the use of telescopes were made: Galileo Galilei used the telescope and when he used the telescope he saw the crater of the moons, sunspot, the four large moons of Jupiter and the rings of saturn. Sir Issac Newton descovered the open door to magnifying very tiny objects with the use of the telescopes.Herschel used a microscope to establish that it had the characteristic thin cell walls of an animal.
The history of the telescope ,It was when the great Italian scientist pointed a telescope toward the night (and even the day) sky that the world changed forever.All these discoveries helped show that the Earth is not the centre of the universe, that the planets orbit a changing and imperfect Sun, and that the planets are other worlds, something like the Earth but very far away. With his telescope, Galileo literally remade the world.
Hale telescope Lenses are used in refracting telescopes. Mirrors are used in reflecting telescopes. The mirrors are ground and polished so that a precise concave surface remains to be coated with a shiny, reflective finish
radio telescope
