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
2010-02-21
35
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 if 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.
If a person’s eye has been looking at an object in bright sunlight for some time, and then shifts to an object not well lit, we can expect ______.
选项
A、a time lag in the focusing ability of the eye
B、some inability to see colors of the latter-named objects until loss of sensitivity has been regained.
C、the immediate less of the "afterimage" of the first object
D、the adaptation in the central area of the eye but little adaptation in the lateral areas to thenew intensity level.
答案
B
解析
综合理解最后一段。B直到失去的感觉恢复后才能看见东西。其他三项文章均未涉及。
转载请注明原文地址:https://kaotiyun.com/show/J0IO777K
0
考博英语
相关试题推荐
WhatisJamesmostinterestedindiscussing?JamessaysthatPeterJoneshasproduced
Whatisthereductioninthecompany’sexports?
Youwillhearaconversationthroughaphone.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.After
●ReadthisletterfromSmith.DearDavisIreceivedamessagethismorningsayingthatourmeetingonFriday12Aprilhadb
•ReadtheadvertisementinthelatestissueofMcGRAW-HILLMAGAZINES.MχFραωHιλλ"Idon’tknowwhoyouare,
Youaresupposedtocompleteaprojectbytheendofthemonth.Butforsomereason,youcannotfinishitonschedule.Writean
•Lookatthegraphsbelow,whichshowthepassengervolumesforeightdifferentairlines.•Whichcompanydoeseachsentence(1
青少年人格上的缺陷反映的是教育思想和教育观念的偏差,而教育思想和教育观念的偏差往往又与传统文化观念上的误区相对应。
我们所知的事实是,战争并非像很多人相信的那样完全是“人性”的产物。如果正如许多人所信的那样,战争和人与人之间的暴力会在整个人类历史上并且在所有或者几乎所有的社会里存在。事实并非如此。考古学家的调查结果似乎表明人类在很久以前是比较讲和平的。举例来说,在早先的
根据“十五”期间的形势和任务,“十五”计划《纲要》提出今后五年经济和社会发展的主要目标是:国民经济保持较快发展速度,经济结构战略性调整取得明显成效,经济增长质量和效益显著提高,为到2010年国内生产总值比2000年翻一番奠定坚实基础:国有企业建立现代企业制
随机试题
在完全竞争市场上,下列说法正确的有
男性,64岁,突发气喘、心慌2小时,高血压病史9年。检查:半卧位,血压200/120mmHg,心率126次/分,律不齐,双肺湿啰音,尿素氮24.2mmol/L,肌酐433μmol/L,血钾5.8mmol/L,诊断:高血压3级(极高危组),急性左心衰竭,肾功
A.局部皮丘隆起,并出现红晕、硬结直径大于1cm,或红晕周围有伪足痒感B.局部皮肤有明显突起的风团或大疹,周围充血或不充血C.局部皮丘红肿,硬结大于1.5cm,红晕可超过4cm,有时出现伪足,主诉痒感D.局部有出血点,直径大于1cm,有丘疹E.局部
以下关于半固定桥的说法中错误的是()
A.米托蒽醌B.依托泊苷C.紫杉醇D.长春新碱E.喜树碱作用DNA拓扑异构酶Ⅱ的抗肿瘤药物是
合同权利和义务终止也称( )。
向社会公开发行股票所发生的发行费用,其会计核算上可以按下列方法处理()。
旅行社可以低于成本的报价招徕旅游者。()
宋学
Manypuremetalshavelittleusebecausetheyaretoosoft,rusttooeasily,orhavesomeother______.
最新回复
(
0
)