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refracting telescope | A Wisdom Archive on refracting telescope | | refracting telescope A selection of articles related to refracting telescope | |
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Refracting telescope
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| ARTICLES RELATED TO refracting telescope | | | | | |  refracting telescope: Encyclopedia II - Binoculars - Optical constructionWhen light strikes an interface between two materials of different refractive index (e.g., at an air-glass interface), some of the light is transmitted, some reflected. In any sort of image-forming optical instrument (telescope, camera, microscope, etc.), ideally no light should be reflected; instead of forming an image, light which reaches the viewer after being reflected is distributed in the field of view, and reduces the contrast between the true image and the background. Reflection can be reduced, but not eliminated, by applying optical ...
See also:Binoculars, Binoculars - Prismatic binoculars, Binoculars - Design details, Binoculars - Optical parameters, Binoculars - Optical construction, Binoculars - Image stabilisation, Binoculars - Maintenance, Binoculars - Choosing binoculars Read more here: » Binoculars: Encyclopedia II - Binoculars - Optical construction |
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| | | | | refracting telescope: Encyclopedia II - Eyepiece - Eyepiece properties Several properties of an eyepiece are likely to be of interest to a user of an optical instrument, when comparing eyepieces and deciding which eyepiece suits their needs.
Eyepiece - Design distance to entrance pupil.
Eyepieces are optical systems where the entrance pupil is invariably located outside of the system. They must be designed for optimal performance for a specific distance to this entrance pupil (i.e. with minimum aberrations for this distance). In a refracting astronomical telescope the entranc ...
See also:Eyepiece, Eyepiece - Eyepiece properties, Eyepiece - Design distance to entrance pupil, Eyepiece - Elements, Eyepiece - Internal reflection and scatter, Eyepiece - Lateral chromatic aberration, Eyepiece - Focal length, Eyepiece - Location of focal plane, Eyepiece - Field of view, Eyepiece - Barrel diameter, Eyepiece - Eye relief, Eyepiece - Eyepiece designs, Eyepiece - Huygens, Eyepiece - Ramsden, Eyepiece - Kellner or achromatized Ramsden, Eyepiece - RKE, Eyepiece - Orthoscopic or orthographic, Eyepiece - Erfle, Eyepiece - Plössl Read more here: » Eyepiece: Encyclopedia II - Eyepiece - Eyepiece properties |
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| | | | | refracting telescope: Encyclopedia II - Light - Speed of light Although some people speak of the "velocity of light", the word velocity should be reserved for vector quantities, that is, those with both magnitude and direction. The speed of light is a scalar quantity, having only magnitude and no direction, and therefore speed is the correct term.
The speed of light has been measured many times, by many physicists. The best early measurement is Ole Rømer's (a Danish physicist), in 1676. By observing the motions of Jupiter and one of its moons, Io, with a telescope, and noting discr ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Speed of light |
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| | | | | | | | refracting telescope: Encyclopedia II - Light - Refraction All light propagates at a finite speed. Even moving observers always measure the same value of c, the speed of light in vacuum, as c = 299,792,458 metres per second (186,282.397 miles per second). When light passes through a transparent substance, such as air, water or glass, its speed is reduced, and it undergoes refraction. The reduction of the speed of light in a denser material can be indicated by the refractive index, n, which is defined a ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Refraction |
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| | | | | refracting telescope: Encyclopedia II - Lens optics - Uses of lenses One important use of lenses is as a prosthetic for the correction of visual impairments such as myopia, hyperopia, presbyopia, and astigmatism. See corrective lens, contact lens, eyeglasses.
Another use is in imaging systems such as a monocular, binoculars, telescope, spotting scope, telescopic gun sight, theodolite, microscope, and camera (photographic lens). A single convex lens mounted in a frame ...
See also:Lens optics, Lens optics - History, Lens optics - Lens construction, Lens optics - Imaging properties, Lens optics - Aberrations, Lens optics - Spherical aberration, Lens optics - Coma, Lens optics - Chromatic aberration, Lens optics - Multiple lenses, Lens optics - Uses of lenses Read more here: » Lens optics: Encyclopedia II - Lens optics - Uses of lenses |
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| | | | | refracting telescope: Encyclopedia II - Lens optics - Uses of lenses One important use of lenses is as a prosthetic for the correction of visual impairments such as myopia, hyperopia, presbyopia, and astigmatism. See corrective lens, contact lens, eyeglasses.
Large convex lenses have been used for hundreds of years to light fires by concentrating the rays of the sun. In this use they are commonly called a burning-glass. Such a lens does not need to be optically accurate to work satisfactorily. A modern variation of this is in combination with a Photovoltaic cell which can work at a higher efficiency when sunlight is ...
See also:Lens optics, Lens optics - History, Lens optics - Lens construction, Lens optics - Imaging properties, Lens optics - Aberrations, Lens optics - Spherical aberration, Lens optics - Coma, Lens optics - Chromatic aberration, Lens optics - Multiple lenses, Lens optics - Uses of lenses Read more here: » Lens optics: Encyclopedia II - Lens optics - Uses of lenses |
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| | | | | | | refracting telescope: Encyclopedia II - Lens optics - Multiple lenses Lenses may be combined to form more complex optical systems. The simplest case is when lenses are placed in contact: if the lenses of focal lengths f1 and f2 are "thin", the combined focal length F of the lenses can be calculated from:
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Since 1/f is the power of a lens, it can be seen that the powers of thin lenses in contact are additive.
If two thin lenses are separated by some distance d, the distance from the second lens to the focal point of the combined lenses is called the back focal length ...
See also:Lens optics, Lens optics - History, Lens optics - Lens construction, Lens optics - Imaging properties, Lens optics - Aberrations, Lens optics - Spherical aberration, Lens optics - Coma, Lens optics - Chromatic aberration, Lens optics - Multiple lenses, Lens optics - Uses of lenses Read more here: » Lens optics: Encyclopedia II - Lens optics - Multiple lenses |
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| | | | | | | | | refracting telescope: Encyclopedia II - Glass - Glass as a liquid One common misconception is that glass is a super-cooled liquid of practically infinite viscosity when at room temperature. Supporting evidence that is often offered is that old windows are often thicker at the bottom than at the top. It is then assumed that the glass was once uniform, but has flowed to its new shape.
The likely source of this belief is that when panes of glass were commonly made by glassblowers, the technique that was used was to spin molten glass so as to create a round, mostly flat and even plate (the Crown ...
See also:Glass, Glass - Properties and Uses, Glass - Glass Ingredients, Glass - Glass as a polymer, Glass - Colors, Glass - History of glass, Glass - Glass tools, Glass - Glass art, Glass - Architectural glass, Glass - Float annealed glass, Glass - Sheet glass, Glass - Plate glass, Glass - Cylinder glass, Glass - Insulated glazing, Glass - Toughened glass, Glass - Laminated glass, Glass - Low-emissivity glass, Glass - Self-cleaning glass, Glass - Evacuated glazing, Glass - Glass as a liquid Read more here: » Glass: Encyclopedia II - Glass - Glass as a liquid |
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| | | | | | refracting telescope: Encyclopedia II - Light - Visible electromagnetic radiation Visible light is the portion of the electromagnetic spectrum between the frequencies of 380 THz (3.8×1014 hertz) and 750 THz (7.5×1014 hertz). The speed (c), frequency (f or ν), and wavelength (λ) of a wave obey the relation:
Because the speed of light in a vacuum is fixed, visible light can als ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Visible electromagnetic radiation |
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| | | | | refracting telescope: Encyclopedia II - Light - Measurement of light The following quantities and units are used to measure the quantity or "brightness" of light.
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Sometimes confusingly called "intensity".
Sometimes confusingly called "intensity".
Sometimes confusingly called "intensity".
watt per steradian per squ ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Measurement of light |
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