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
The Television Camera The television camera is rather like the human eye. Both the eye and the camera have a lens, and both
The Television Camera The television camera is rather like the human eye. Both the eye and the camera have a lens, and both
admin
2011-01-05
79
问题
The Television Camera
The television camera is rather like the human eye. Both the eye and the camera have a lens, and both produce a picture on a screen. In each case the picture is made up of millions of spots of light.
Let us see how the eye works. When we look at an object-a person, a house, or whatever it may be, we do not see all the details of the object in one piece. We imagine that we do, but this is not the case. In fact, the eye builds up the picture for us in our brain, which controls our sight, in millions of separate parts, and although we do not realize it, all these details are seen separately. This is what happens when we look at something. Beams of light of different degrees of intensity, re-fleeted from all parts of the object, strike the lens of the eye. The lens then gathers together the spots of light from these beams and focuses them on to a light-sensitive plate-the retina-at the back of the eyeball. In this way, an image of the object is produced on the retina in the form of a pattern of lights. The retina contains millions of minute light-sensitive elements, each of which is separately connected to the brain by a tiny fiber in the optic nerve. These nerve fibers, working independently, pick out minute details from the image on the retina and torn the small spots of light into nerve impulses of different strengths. They then transmit these impulses to the brain. They do this all at the same time. All the details of the image are fed to the brain, and as we have taught our brain to add them together correctly, we see a clear picture of the object as a whole.
Television, which means vision at a distance, operates on a similar principle. A television picture is built up in thousands of separate parts. Beams of light reflect from the subject being televised strike the lens of the television camera, which corresponds to the lens of the eye. The camera lens gathers together the spots of light from these beams and focuses an image of the subject on to a plate, the surface of which is coated with millions of photo-electric elements sensitive to light. The spots of light forming the image on the plate cannot be transmitted as light. So they are temporarily converted by an electronic device into millions of electrical impulses ; that is, into charges of electricity. These electrical impulses are then sent through space on a wireless wave to the homes of the viewers. They are picked up by the aerials and conveyed to the receivers to the television set. There, they are finally converted back into the spots of light that make up the picture on the television screen.
All the raps of light reflected from objects are______.
选项
A、of the same intensity
B、of varying intensity
C、to some degree intense
D、not at all intense
答案
B
解析
文中第二段提到“Beams of light of different degrees of intensity,reflected from all parts of the object,strike the lens of the eye.”从物体各部分反射出的不同亮度的光束射到眼睛的晶状体上。different.即不同的,同varying(变化的)相似,其他答案不符合意思。
转载请注明原文地址:https://kaotiyun.com/show/RIQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
CollegeNightOwlsHaveLowerGrades Collegestudentswhoaremorningpeopletendtogetbettergradesthanthosewhoarenig
NappingtoaHealthierHeart?1Researcherssaytheyhavedevelopedasimpletestthatcantellifapersonwithheartdisea
NappingtoaHealthierHeart?1Researcherssaytheyhavedevelopedasimpletestthatcantellifapersonwithheartdisea
Wewereattractedbythelureofquickmoney.
AcandidatesforclinicaltrialsBduringthetrialCmedicalknowledgeDinhumansEbeforeparticipationFforsomepatients
FlyingintoHistoryWhenyouturnonthetelevisionorreadamagazine,celebrities(名人)areeverywhere.Althoughfameandt
EffectsofExerciseonElderlyDiabetics(糖尿病人)Mostolderpeoplewith.so-calledtype2diabetes(糖尿病)couldstoptakingins
Thepolicewillneedtokeepawaryeyeonthisareaoftown.
SpareaKidney?Itisnolongerunusualforaspouseorrelativetodonateakidneyt0alovedone,butthenumberofAmer
随机试题
天花粉的药用部分是
关于投资项目风险基本特征和识别原则,下列叙述正确的是()。
水闸中的铺盖按材料分,其类型有()。
投资连接保险中的投资风险由()承担。
C公司只生产一种产品。相关预算资料如下:资料一:预计每个季度实现的销售收入均以赊销方式售出,其中60%在本季度内收到现金,其余40%要到下一季度收讫,假定不考虑坏账因素。部分与销售预算有关的数据如表1所示:资料二:预计每个季度所需要的直接材料
较为符合我国国情和社区工作现状的社区工作模式是地区发展、社会策划和()三个实施模式。
共鸣
教育部公布的《国家教育事业发展第十二个五年规划》提出,推动各地制定非户籍常住人口在流入地接受()阶段教育的办法。
根据所给材料。回答问题。印刷组和装订组的成员来自以下七名员工——F,G,H,J,K,L和M,每个组的成员构成必须满足下列条件:(1)每个组至少有三名员工;(2)F和K不能在同一个组;(3)如果K在某个组,J也必须在这
InhermovieChocolat,filmmakerClaireDenisshuns______andattemptsinsteadtodepicteventsasrealisticallyaspossible.
最新回复
(
0
)