| 单词 | index of refraction |
| 例句 | The difference in index of refraction between the two materials defines the angle of that bending. Engineered Metamaterials Can Trick Light and Sound into Mind-Bending Behavior 2022-11-18T05:00:00Z The change in the speed of light is related to the indices of refraction of the media involved. College Physics for AP Courses 2015-08-12T00:00:00Z The specific temperature profile is key, since the air’s temperature determines its index of refraction. Floating land, wall of water appear over Chesapeake Bay amid rare mirage 2021-03-15T04:00:00Z When light passes into a material of a different index of refraction, which is often proportional to the density, part of the light reflects and part of it bends. A World of Creatures That Hide in the Open 2014-08-18T04:00:00Z In regards to the second photon, the region of the Rydberg state has a different index of refraction than the rest of the gas. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z Light entering a medium with a negative index of refraction, on the contrary, would bend backward, creating unexpected optical effects, such as a straw appearing to lean the wrong way. Engineered Metamaterials Can Trick Light and Sound into Mind-Bending Behavior 2022-11-18T05:00:00Z In the situations shown in Figure 25.11, medium 2 has a greater index of refraction than medium 1. College Physics for AP Courses 2015-08-12T00:00:00Z Since the air’s index of refraction changed so dramatically in the lowest levels of the atmosphere, light that would otherwise rise was instead refracted back toward the ground. Floating land, wall of water appear over Chesapeake Bay amid rare mirage 2021-03-15T04:00:00Z The varying index of refraction the team achieved happens to be very similar to the bending of space-time geometry around a massive star. Curved Space-time Mimicked on a Chip 2013-09-30T20:45:00.877Z The index of refraction describes how light or radiation travels through a medium.It is measured by the ratio of the speed of light in a vacuum to the speed of light in a substance. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z For instance, it takes energy to change a material's index of refraction. Something from Nothing? A Vacuum Can Yield Flashes of Light 2013-02-12T14:45:00.290Z Diamonds sparkle due to total internal reflection coupled with a large index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z They've developed a tiny device in which the index of refraction for visible light is zero—so that light waves of a particular wavelength move infinitely fast. Nanoscale Device Makes Light Travel Infinitely Fast 2012-11-06T22:38:49Z The amount of separation is very small, and depends on the thickness of the glass, the index of refraction and the focal length of the telescope. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z But knowing the index of refraction for the two media presented, and the familiar law of the sines, we can easily reproduce or fill out in thought every conceivable case of refraction. Popular scientific lectures 2012-04-24T02:00:17.273Z If the ordinary index of refraction be greater than the extraordinary index, the crystal is said to be optically negative, whilst if less the crystal is optically positive. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Suppose light were incident from air onto a material that had a negative index of refraction, say –1.3; where does the refracted light ray go? College Physics for AP Courses 2015-08-12T00:00:00Z The index of refraction generally bears a relation to the specific gravity of the stone, the heaviest gems having the highest indices, though a few minerals offer exceptions. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z "Glossiness depends upon material properties like the smoothness of a surface and its index of refraction," says Mr Toomey. Glossy male birds are more 'sexy' 2010-03-23T14:59:00Z As soon as we have cleared matters up by our index of refraction we discover that a special index is necessary for each color. Popular scientific lectures 2012-04-24T02:00:17.273Z The indices of refraction vary, not only for light of different colours, but also slightly with the temperature. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Explain in terms of indices of refraction and angles, perhaps referring to Figure 25.47. College Physics for AP Courses 2015-08-12T00:00:00Z Within a few minutes it takes on a dark brown colour, and is then mounted in a saturated lævulose solution, whose index of refraction is very high. Histology of the Blood Normal and Pathological Percent of chicory = 100 ————————— 0.01835 The index of refraction of the above solution may be taken with the Zeiss immersion refractometer or with the Abbe refractometer. All About Coffee A glass rod is visible in air or in water, but it is almost invisible in a mixture of benzol and bisulphuret of carbon, which has the same mean index of refraction as the glass. Popular scientific lectures 2012-04-24T02:00:17.273Z This paper deals with the indices of refraction of metals. On Laboratory Arts Suppose you have an unknown clear substance immersed in water, and you wish to identify it by finding its index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z Electric rays also undergo refraction and he described an ingenious method he had devised by which the index of refraction of numerous opaque substances could be obtained with the highest exactitude. Sir Jagadis Chunder Bose His Life and Speeches It is a curious property of this vibrational system of invisibility that the index of refraction is made very low. The Black Star Passes Air, finally, has so small an index of refraction and so small a deflective influence upon light, that the refractive effect is commonly imperceptible altogether. Popular scientific lectures 2012-04-24T02:00:17.273Z The cementing medium is linseed oil, the index of refraction of which is 1.485. Scientific American Supplement, No. 441, June 14, 1884. Your instructor may wish to guide you on the level of complexity to consider and on how the index of refraction varies with air density. College Physics for AP Courses 2015-08-12T00:00:00Z The index of refraction of these substances tends in the case of great wave-lengths to become, as the theory anticipates, nearly the square root of the dielectric constant. The New Physics and Its Evolution He called the quotient the index of refraction. Six Lectures on Light Delivered In The United States In 1872-1873 And only by comparing the refractions of light of different colors, does the difference, the inequality of the indices of refraction, arrest the attention. Popular scientific lectures 2012-04-24T02:00:17.273Z If balsam of copaiba is made use of, the index of refraction of which is 1.50, a symmetrical field of about 24� will be obtained. Scientific American Supplement, No. 441, June 14, 1884. If there is air outside and the incident angle is 45.0º , what must be the minimum index of refraction of the material from which the reflector is made? College Physics for AP Courses 2015-08-12T00:00:00Z The correction for the velocity of light in vacuo is found by multiplying the speed in air by the index of refraction of air, at the temperature of the experiments. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis One of them obeys the ordinary law of refraction discovered by Snell, and is, therefore, called the ordinary ray: its index of refraction is 1.654. Six Lectures on Light Delivered In The United States In 1872-1873 Their minds had the same index of refraction, so that thoughts flashed back and forth between them effortlessly and without distortion. Mary Wollaston The length of the prism is 3.75 times its breadth, and if the cement has an index of refraction of 1.525, the field is symmetrically disposed, and includes an angle of 27�. Scientific American Supplement, No. 441, June 14, 1884. What is the index of refraction for the liquid and its likely identification? College Physics for AP Courses 2015-08-12T00:00:00Z A friend tells me the phenomenon is probably due to inorganic substances floating in the air—each substance in diffusion having its own index of refraction. Two Years in the French West Indies The 'index of refraction' of a ray passing from air into water is 4/3. Six Lectures on Light Delivered In The United States In 1872-1873 The angle of refraction depends on the index of refraction, as we saw in The Law of Refraction. College Physics for AP Courses 2015-08-12T00:00:00Z The latter advantage, however, occurs only when the difference between the indices of refraction for the ordinary and extraordinary rays in the particular crystal made use of is greater than in calc-spar. Scientific American Supplement, No. 441, June 14, 1884. Can the second group determine a value for the index of refraction of the gas from only this data? College Physics for AP Courses 2015-08-12T00:00:00Z Since the index of refraction varies with wavelength, the angles of refraction vary with wavelength. College Physics for AP Courses 2015-08-12T00:00:00Z It is then only necessary to seek out its natural tangent to obtain the index of refraction. Six Lectures on Light Delivered In The United States In 1872-1873 A sequence of red to violet is produced, because the index of refraction increases steadily with decreasing wavelength. College Physics for AP Courses 2015-08-12T00:00:00Z As the cementing substance for the nitrate of soda, a mixture of gum dammar with monobromonaphthalene was used, which afforded an index of refraction of 1.58. Scientific American Supplement, No. 441, June 14, 1884. The index of refraction of the plastic is known. College Physics for AP Courses 2015-08-12T00:00:00Z Since the index of refraction of the lens is greater than that of air, the ray moves towards the perpendicular as it enters and away from the perpendicular as it leaves. College Physics for AP Courses 2015-08-12T00:00:00Z The polarizing angle augments with the index of refraction. Six Lectures on Light Delivered In The United States In 1872-1873 Since the index of refraction of lenses depends on color or wavelength, images are produced at different places and with different magnifications for different colors. College Physics for AP Courses 2015-08-12T00:00:00Z Violet rays are bent more than red, since they have a higher index of refraction and are thus focused closer to the lens. College Physics for AP Courses 2015-08-12T00:00:00Z The hollow space is filled with a gas, and the students are asked to collect the data needed to find the index of refraction of the gas. College Physics for AP Courses 2015-08-12T00:00:00Z These rays will interfere in a way that depends on the thickness of the film and the indices of refraction of the various media. College Physics for AP Courses 2015-08-12T00:00:00Z With the aid of this law and an apparatus similar to that figured at page 15, we can readily determine the index of refraction of any liquid. Six Lectures on Light Delivered In The United States In 1872-1873 Note also that there is an additional λ / 2 phase shift when light reflects from a medium with a greater index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z Since the part of the light that is not reflected is refracted, the amount of polarization depends on the indices of refraction of the media involved. College Physics for AP Courses 2015-08-12T00:00:00Z If the index of refraction of the fluid is lower than that of water, the light will slow down and turn toward the normal. College Physics for AP Courses 2015-08-12T00:00:00Z Since the indices of refraction differ, the number of wavelengths in the paths differs. College Physics for AP Courses 2015-08-12T00:00:00Z The object shown has a greater index of refraction than the background, and so the wavelength decreases as the ray passes through it. College Physics for AP Courses 2015-08-12T00:00:00Z The index of refraction of the lens is about 1.5, and its top surface is dry. College Physics for AP Courses 2015-08-12T00:00:00Z What is the index of refraction of a material for which the wavelength of light is 0.671 times its value in a vacuum? College Physics for AP Courses 2015-08-12T00:00:00Z The diameter and index of refraction of the lens. College Physics for AP Courses 2015-08-12T00:00:00Z What wavelength and color of visible light is most constructively reflected, assuming the same index of refraction as water? College Physics for AP Courses 2015-08-12T00:00:00Z Light reflecting from a medium having an index of refraction less than that of the medium in which it is traveling. College Physics for AP Courses 2015-08-12T00:00:00Z Snell’s experiments showed that the law of refraction was obeyed and that a characteristic index of refraction n could be assigned to a given medium. College Physics for AP Courses 2015-08-12T00:00:00Z Snell was not aware that the speed of light varied in different media, but through experiments he was able to determine indices of refraction from the way light rays changed direction. College Physics for AP Courses 2015-08-12T00:00:00Z Layers of tissues with varying indices of refraction in the lens are shown here. College Physics for AP Courses 2015-08-12T00:00:00Z Snell’s law states the relationship between angles and indices of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z There is no total reflection for rays going in the other direction—for example, from air to water—since the condition that the second medium must have a smaller index of refraction is not satisfied. College Physics for AP Courses 2015-08-12T00:00:00Z Without cladding, light could pass between fibers in contact, since their indices of refraction are identical. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 25.15 Fibers in bundles are clad by a material that has a lower index of refraction than the core to ensure total internal reflection, even when fibers are in contact with one another. College Physics for AP Courses 2015-08-12T00:00:00Z Table 25.1 gives the indices of refraction for some representative substances. College Physics for AP Courses 2015-08-12T00:00:00Z Why is the index of refraction always greater than or equal to 1? College Physics for AP Courses 2015-08-12T00:00:00Z What is the index of refraction of the substance and its likely identity? College Physics for AP Courses 2015-08-12T00:00:00Z The speed of light in a medium is v = c / n , where n is its index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z That is, what limits would there be on the index of refraction and thickness of the coating? College Physics for AP Courses 2015-08-12T00:00:00Z If, as shown in the figure, the index of refraction for the second medium is less than for the first, the ray bends away from the perpendicular. College Physics for AP Courses 2015-08-12T00:00:00Z Take the wavelength to be 680 nm, and assume the same index of refraction as water. College Physics for AP Courses 2015-08-12T00:00:00Z Light reflecting from a medium having an index of refraction greater than that of the medium in which it is traveling. College Physics for AP Courses 2015-08-12T00:00:00Z We know that the index of refraction n depends on the medium. College Physics for AP Courses 2015-08-12T00:00:00Z The index of refraction of the plastic is known. College Physics for AP Courses 2015-08-12T00:00:00Z The index of refraction outside the fiber must be smaller than inside, a condition that is easily satisfied by coating the outside of the fiber with a material having an appropriate refractive index. College Physics for AP Courses 2015-08-12T00:00:00Z The hollow space is filled with a gas, and the students are asked to collect the data needed to find the index of refraction of the gas. College Physics for AP Courses 2015-08-12T00:00:00Z What information would you need to collect, and how would you use this information in order to deduce the index of refraction of the gas in the cube? College Physics for AP Courses 2015-08-12T00:00:00Z Light travels through water and crosses a boundary at a non-normal angle into a different fluid with an unknown index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z If the index of refraction of the fluid is higher than that of water, the light will speed up and turn toward the normal. College Physics for AP Courses 2015-08-12T00:00:00Z Fibers in bundles are surrounded by a cladding material that has a lower index of refraction than the core. College Physics for AP Courses 2015-08-12T00:00:00Z If the index of refraction of the fluid is higher than that of water, the light will slow down and turn away from the normal. College Physics for AP Courses 2015-08-12T00:00:00Z If the index of refraction of the fluid is lower than that of water, the light will speed up and turn away from the normal. College Physics for AP Courses 2015-08-12T00:00:00Z A student wishes to predict the magnification of an image given the distance from the object to a converging lens with an unknown index of refraction. College Physics for AP Courses 2015-08-12T00:00:00Z Since the index of refraction of the tear layer and the cornea are very similar, you now have a regular optical surface in place of an irregular one. College Physics for AP Courses 2015-08-12T00:00:00Z |
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