首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
admin
2005-11-28
67
问题
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colors seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties of surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually(but not always)looking much the same in artificial light as in daylight. Both of these effects seem to be due in large part to the mechanism of color adaptation mentioned earlier.
When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Shouted, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" superimposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation". Also, because of the persistence of the effect of the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become uniform over the whole eye.
This selection is primarily concerned with______.
选项
A、the eye’s adaptation to color
B、the properties of colored surfaces
C、the color of colors
D、the effect of changes in color intensity
答案
A
解析
从文中的“Both of these effects seem to be due in large part to the mechanism of color adaptation mentioned earlier.”可知,A项“眼睛对色彩的适应性”符合文意。其他三项中B项指道具表面颜色,C项指色彩本身,D项指颜色突然转换的影响都不正确。
转载请注明原文地址:https://kaotiyun.com/show/LFIO777K
0
考博英语
相关试题推荐
—Readthearticlebelowaboutpublicimage.—Choosethebestwordtofilleachgap,fromA,B,CorD.—Foreachquestion19—33,
•Readthearticlebelowaboutadvertising.•Choosethebestsentencefromtheoppositepagetofilleachofthegaps.•Forea
Readthearticlebelowaboutenhancede-books’influenceonliterature,andthequestionsontheoppositepage.Foreachque
Lookatthestatementsbelowandthetextontheoppositepageabouttheexportmarketoffourcountries.Whichsection(A,B
Readthearticlebelowaboutmarketresearch.Inmostofthelines(34-45),thereisoneextraword.Itiseithergrammatical
Readthearticlebelowaboutworkingininternationalteams.Choosethebestsentencefromtheoppositepagetofilleachof
Whydidlanstarthiscareersellingsportsequipment?WhydidSolutionsdecidetospecialiseinchangemanagement?
WhenIwasakid,Ineverknewwhatmyparents—oranyoneelse’s—didforaliving.AsfarasIcouldtell,allgrownupshadm
各学科的发展日新月异,令人称奇,但衡量知识、能力的方法却依然如故,非常原始。迄今为止,教育工作还没有找到比考试更有效、更可靠的方法,着实有点离奇。尽管有不少人认定,考试能衡量出一个人的知识水平,但实际情况恰恰相反,这是有目共睹的。要想考察一个人死记硬背的本
Confucianismhasevolvedintoacultureofrationalistictraditionalism,acombinationoftraditional______andgroupvirtuesw
随机试题
以下细胞属于变异的R-S细胞的是
Lifeisnoteasy,soI’dliketosay"Whenanythinghappens,believeinyourself."WhenIwasayoungboy,Iwas【31】shytotalk
下列选项中,属于无因管理的是()
发热,恶热,烦躁,口渴喜冷,汗多,大便干结。小便短赤,舌红绛,见于
关于CT增强扫描的描述,下列哪一些是正确的
大秦艽汤的功用是()
()属于对代理人代理权的限制。[2006年11月二级真题]
植被具有明显的年际变化和季节变化的特点,并且是联结土壤、大气和水分的自然纽带,在一定程度上能体现土地覆盖的变化,所以在全球变暖中充当“指示器”的作用。研究表明,在全球尺度和洲际尺度上,气温升高是导致全球特别是北半球植被活动增加的主导因素,由此可以通过植被活
InNewOrleans,MoonWalk—apathwayalongastretchoftheMississippi—nowprovidesthepublicaccessthathadpreviouslybe
Manypeoplehavediscoveredthathobbiescanbeprofitableaswellas【T1】______.Somepeoplehavefinecollectionsofbottles,f
最新回复
(
0
)