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You are watching: Chromatic aberration occurs in a refracting telescope when

As irradiate passes native air into a dense but transparent material itA.speeds up.
B.slows down.
C.maintains the speed.
D.changes its speed to the speed of sound in glass.
2.What is the refraction of light?A.the readjust in direction of a light ray together it reflects from a much more dense product than the one in which that is traveling
B.the absorb of light as it traverses a dense, transparent material
C.the breaking of white light into its composite colors
D.the adjust in direction the a light ray as it crosses from a much less dense, transparent material to a much more dense one
3.Which characteristic of a glass lens is the most crucial in bending light rays to form a concentrated image?A.curvature and also shape the its surfaces
B.color of the glass
C.diameter or size of the lens
D.thickness of the center of the lens
4.The key optical facet in a refracting telescope is aA.lens.
B.mirror.
C.combination that many small plane mirrors.
D.prism of glass.
5.Who was the very first astronomer to build and use a telescope to observe the night sky?A.Copernicus
B.Newton
C.Tycho Brahe
D.Galileo
6.The significant reason astronomers look for funds to develop larger telescopes is toA.bring stars closer to Earth.
B.measure a wider spectrum of light from stars.
C.provide magnified images the stars.
D.collect more light from remote objects.
7.For many years, the Palomar telescope (5 m diameter) in California was the largest completely steerable telescope in the world; currently that honor falls to among the 2 Keck telescopes (each that diameter 10 m) in Hawaii. How plenty of times larger is the light-gathering strength of the Keck telescope 보다 the Palomar telescope?A.2 time larger
B.4 time larger
C.1.4 times larger
D.8 times larger
8.In a correctly focused refracting telescope, the objective lens and the eyepiece lens space separated through a distance equal come the (see Fig. 6-5, Freedman and also Kaufmann, Universe, 6th ed.)A.focal length of the eyepiece.
B.focal length of the objective minus the focal length of the eyepiece.
C.sum that the focal length lengths that objective and eyepiece.
D.focal length of the objective.
9.Which the the following varieties of telescope will endure from chromatic aberration unless really expensive steps are taken to avoid it?A.radio telescope
B.cassegrain telescope
C.reflecting telescope
D.refracting telescope
10.Chromatic aberration occurs in a refracting telescope whenA.some wavelengths are reflected from the front surface of the target lens of the telescope.
B.light from some wavelengths is took in by the lenses, thereby developing false colour of objects.
C.the lenses bending under their very own weight, in order to distorting the final image.
D.all colour of light execute not come to the very same focal point.
11.If you desire to build a telescope having actually the least possible amount that chromatic aberration, you need to useA.mirrors instead of lenses.
B.as thin a prior lens together possible.
C.a prior lens that has actually been coated v a special material to minimize refraction.
D.a front lens that is composed of two carefully spaced lenses make of various kinds of glass.
12.When a beam of light strikes a smooth mirror surface ar at an edge to the perpendicular, the beam is reflectedA.at various angles, depending upon wavelength.
B.back along its initial (incoming) path.
C.so the it travels follow me the perpendicular to the surface ar of the mirror.
D.on the "other" side of the perpendicular yet at the same angle as the just arrived ray.
13.How is a Newtonian showing telescope constructed?A.A collection of winter channel the light to a far location.
B.It has actually a concave primary mirror and flat, diagonal second mirror.
C.A concave primary mirror, through a concave an additional mirror that reflects light back through a hole in the main mirror.
D.A concave primary mirror, v a convex secondary mirror that shows light ago through a feet in the primary mirror.
14.When light from the concave main mirror the a telescope is reflect by a small an additional mirror v a hole in the primary, the is calledA.prime focus.
B.Newtonian focus.
C.Cassegrain focus.
D.Coude focus.
15.If part of the main mirror that a mirroring telescope is clogged off by a little screen, i beg your pardon of the following features of the final image is affected?A.Although the brightness is unaffected, the size of the image will it is in reduced.
B.A part of the image is missing.
C.Only the brightness is reduced.
D.Depending top top which part of the winter is obscured, the color of the image is affected.
16.To produce the sharpest images of an extremely distant objects, the finest shape for the cross-section the a large astronomical mirror have to beA.elliptical.
B.spherical.
C.perfectly flat and also smooth.
D.parabolic.
17.A spherical mirror suffers from spherical aberration becauseA.the starlight is distorted by turbulence in the Earth"s atmosphere.
B.the winter sags under its very own weight, distorting the image.
C.different parts of the mirror emphasis the irradiate at various distances indigenous the mirror.
D.different colour are concentrated at different distances native the mirror.
18.The major mirror in the 10-m Keck telescope is do fromA.one large, slim slab that glass whose surface is continuously changed by computer-controlled motors.
B.36 separation, personal, instance mirrors, placed so the they all carry the irradiate to the very same focus.
C.six individual mirrors placed so that they all carry the light to the same focus.
D.one huge slab the glass made very thick to protect against sagging.
19.In telescopes, the resolution is worse forA.larger diameter lenses or winter and shorter wavelength light (or other electromagnetic radiation).
B.smaller diameter lenses or mirrors and longer wavelength irradiate (or various other electromagnetic radiation).
C.smaller diameter lenses or winter and much shorter wavelength light (or various other electromagnetic radiation).
D.larger diameter lenses or mirrors and longer wavelength irradiate (or various other electromagnetic radiation).
20.At the too much limit that magnification, the significant cause of blurred and also unsharp images of objects observed v very huge telescopes isA.the poor tracking ability of contemporary telescopes.
B.air turbulence in the Earth"s atmosphere.
C.the poor optical polishing achievable on large mirrors.
D.the clumsiness of the telescope operator.
21.It is difficult to boost the angular resolution the optical telescopes located on the surface ar of the Earth beyond a specific limit becauseA.we would require to build larger telescopes and also this is an extremely expensive.
B.spherical mirrors suffer from too much aberration.
C.air disturbance distorts the star images an ext than walk the telescope optics.
D.large telescopes are constantly reflecting telescopes and these endure from too much chromatic aberration.
22.What aspect has seriously decreased the effectiveness of the telescopes approximately the world, such together those in ~ Mt. Palomar in California and at Kitt Peak, near Tucson, Arizona, end the last few years?A.tarnishing that the mirror surface by air pollution
B.cracking that the mirror by earthquakes
C.bending that the mirror surface ar from repeated exposure come the cold night air
D.light scattering in the atmosphere from nearby cities
23.The detector the in plenty of instances has replaced the photographic plate for huge photography is theA.diffraction grating.
B.CCD (charge-coupled device).
C.interferometer.
D.PMT (photomultiplier tube).
24.The charged-coupled an equipment (CCD), currently used extensively for expensive imaging, works on what principle?A.Light generates electric charge ~ above a computer-readable, multi-element variety of detectors.
B.Light from the photo modifies the plastic product on a disk, which can then be read on a standard video compact decaying (CD) player.
C.Light indigenous the photo is detected by new, high-sensitivity, fine-grain, automatically processed film.
D.A single optical detector generates an electric signal together it is scanned quickly across the astronomical image.
25.A spectrograph is usually provided in astronomy to measure theA.variation the the mass of things as it moves through space.
B.distribution of irradiate intensity among the miscellaneous colors.
C.vibration of earth following an earthquake.
D.brightness of irradiate at one particular color.
26.How walk angular resolution because that a offered diameter that telescope depend on wavelength?A.Angular resolution intensifies as wavelength increases.
B.Angular resolution improves as wavelength increases.
C.Angular resolution may enhance or worsen together wavelength increases, relying on other components such together intensity and spectral selection (e.g., optical, infrared, radio).
D.Angular resolution depends just on the diameter of the telescope and also is live independence of wavelength.
27.The angular resolution attainable v a radio telescope, contrasted to that attainable v an optical telescope of the very same diameter, is considerably inferior becauseA.the wavelength that radio tide is bigger than that of visible light.
B.it is complicated to make a reflector because that radio waves due to the fact that these waves penetrate most materials.
C.the Earth"s atmosphere disturbs radio waves from room much much more than that does visible light.
D.radio wavelength are smaller than visible wavelengths, do it an overwhelming to develop a reflector sufficiently smooth to develop images.
28.What is the main reason because that combining numerous radio telescopes together into an interferometer with large distances in between telescopes?A.to obtain much sharper photos of sources
B.to ensure that at the very least one that the telescopes is in a radio interference-free zone
C.to for sure that monitorings are uninterrupted through the failure of one or 2 telescopes
D.to collect an ext radiation from really faint sources
29.The two varieties of electromagnetic radiation for which Earth"s atmosphere is reasonably transparent areA.UV and also radio waves.
B.visible and also far infrared radiation.
C.X rays and also visible radiation.
D.visible and also radio radiation.
30.Astronomy from space vehicles is particularly useful since the telescopeA.is in a clean, dust-free environment and scattered irradiate is lot reduced.
B.is over Earth"s soaking up and distortion atmosphere and can measure radiation over a very wide wavelength range.
C.is in a gravity-free state, its winter is no distorted through gravitational stress, and it can develop sharper images.
D.moves clear in a constant orbit and can produce sharp photographs.
31.For which of the complying with spectral ranges is it important that huge observations it is in made native space?A.visible
B.far UV
C.radio
D.near infrared
32.After the Hubble an are Telescope to be launched, that was found to experience seriously fromA.chromatic aberration.
B.spherical aberration.
C.too much angular resolution.
D.jittery photos caused by strong stratospheric winds.
33.The very first nonvisible radiation detected from outer space wasA.X rays.
B.radio waves.
C.gamma rays.
D.ultraviolet (UV) light.

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