| 单词 | spherical aberration |
| 例句 | Diffraction spreading for a flashlight is insignificant compared with other limitations in its optics, such as spherical aberrations in its mirror. College Physics for AP Courses 2015-08-12T00:00:00Z One example is Land’s discussion of graded-index lenses in aquatic animals, which achieve high power without spherical aberration, using a smooth transition from low to high refractive power. Optical wonderlands: vision science from photons to philosophy 2018-11-06T05:00:00Z The problem was a slight optical defect called spherical aberration. Eight Spacecraft that Have Been Rescued, Resurrected and Repurposed 2015-06-17T04:00:00Z That wasn’t the case at first: The Hubble has a 2.4-meter diameter mirror with a notorious “spherical aberration” that blurred the telescope’s initial images. Still sharp, Hubble Space Telescope turns 25 with a cloudy future 2015-04-21T04:00:00Z But when the first image came back, it was blurry owing to a flaw known as spherical aberration. Biography of a space telescope: Voices of Hubble The Super Spectra coating helps reduce ghosting and spherical aberration. Canon Introduces Sharp, Fast Lenses, Including EF 24-70mm f/2.8 IS USM 2012-02-07T16:04:47Z This results in an increase in refractive-index as the center of the lens is approached and tends to diminish its spherical aberration. Visual Illusions Their Causes, Characteristics and Applications 2011-06-02T02:00:25.247Z The combination is so designed that the spherical aberration of the one pair neutralises that of the other, and the result is or should be a lens corrected both for chromatic and spherical aberration. Optical Projection Part 1: Projection of Lantern Slides Another obvious inference from the necessary imperfection of optical images is the uselessness of attempting anything like an absolute destruction of spherical aberration. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" One of the astronomers on our team looked at the image and said, “This telescope has spherical aberration.” Biography of a space telescope: Voices of Hubble The rays that pass near the outer edge of the lens have a shorter focus than that of the rays which pass near the center of the lens; this is called spherical aberration. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Irradiation has also been ascribed to spherical aberration in the eye-lens and to diffraction of light at the pupil. Visual Illusions Their Causes, Characteristics and Applications 2011-06-02T02:00:25.247Z We have now reviewed the three chief defects of a lens—chromatic aberration, spherical aberration, and distortion—and have seen how they may be remedied. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use The glass must be achromatic;it must have a small spherical aberration for rays converging to the principal focus. On Laboratory Arts We moved the secondary mirror in and out of focus in order to sample the spherical aberration at different levels. Biography of a space telescope: Voices of Hubble The centers of curvature of the different rings receded from the axis as their distance from the center increased, in such a manner as to overcome a serious optical defect known as spherical aberration. Artificial Light Its Influence upon Civilization The indistinctness of the image is partly due to the obliquity of the pencils which form parts of the image, and partly to what is termed spherical aberration. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. This wonderful lens is achromatic, and free from spherical aberration and distortion of image. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use This may be due to uncorrected spherical aberration, particularly to a fault known as "zonal aberration," where different zones of the lens have different foci, but each zone has a definite focus. On Laboratory Arts This arises from an imperfection of the glass lens, called its spherical aberration, which is due to the fact that the circumferential and central rays have not the same focus. Six Lectures on Light Delivered In The United States In 1872-1873 This device was "silvered" on the outside and the refraction in the glass, as the light passed through it to the mirror and back again, corrected the spherical aberration of the mirrored surface. Artificial Light Its Influence upon Civilization To determine whether the spherical aberration is corrected, the telescope should be directed towards a star of the third or fourth magnitude, and focussed for distinct vision. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. The effect of thickness of lenses was shown by a diagram of the ingenious method of Mr. F. Wenham, who had long ago by this means corrected spherical aberration in microscopic objective. Scientific American Supplement, No. 415, December 15, 1883 It requires the middle of the aperture stop to be reproduced in the centres of the entrance and exit pupils without spherical aberration. The Project Gutenberg Encyclopedia Volume 1 of 28 This is called spherical aberration, and to it is due the want of distinctness which is frequently noticed around the edges of pictures taken in the camera. American Hand Book of the Daguerreotype These insights made it possible for jewellers and weavers to use lenses to view their work instead of glass globes full of water, which distorted all but the center of the image: "spherical aberration". Our Legal Heritage : 600-1776 King Aethelbert - King George III If no new adjustment is required for distinct vision, the spherical aberration is corrected, since the mean focal length and the focal length of the central rays are equal. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. But if there is any spherical aberration or differences of density in different parts of the glass, the image will appear distorted in various ways. Side-Lights on Astronomy and Kindred Fields of Popular Science In a plane containing the image point of one colour, another colour produces a disk of confusion; this is similar to the confusion caused by two ``zones'' in spherical aberration. The Project Gutenberg Encyclopedia Volume 1 of 28 At the earliest period of the employment of the camera obscura, a double-convex lens was used to produce the image; but this form was soon abandoned, on account of the spherical aberration so caused. American Hand Book of the Daguerreotype This combination largely overcame the spherical aberration, and it gained immediate fame as the "Wollaston doublet." A History of Science — Volume 4 The extent of the spherical aberration may be thus determined; but if the first experiment gives a satisfactory result, no other is required. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. He may also find that there is some spherical aberration outstanding. Side-Lights on Astronomy and Kindred Fields of Popular Science Of thin positive lenses with n=1.5, four are necessary to correct spherical aberration of the third order. The Project Gutenberg Encyclopedia Volume 1 of 28 |
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