Question

为什么苍蝇有无数的眼睛

Answer 1

　　苍蝇的眼睛是昆虫眼，又叫复眼.复眼（Compound eye）由多数小眼组成。复眼中的小眼面一般呈六角形。小眼面的数目、大小和形状在各种昆虫中变异很大，雄性介壳虫的复眼仅由数个圆形小眼组成。家蝇的复眼由4000个小眼组成，蝶、蛾类的复眼有28000个小眼。小眼面的大小，不但在不同种的昆虫中不同，而且同一个复眼中不同部位的小眼面也可不同，如雄性牛虻，复眼背面的小眼面较大；有些毛蚊（Biblio），其前后部的小眼面的大小也不同，可划分为两个区域。这些变化与它们的生活习性等有关。苍蝇的一只复眼是由4000多只小眼组成的，这些小眼睛组成一个蜂窝一样的形状堆积在苍蝇的头两边。复眼对苍蝇的生活来说可重要了，苍蝇身上的许多部分都是与复眼直接相连，复眼看到目标之后，苍蝇就立刻出动，干起新的坏事。可别小看苍蝇的复眼，它们观察物体比我们人类还要仔细和全面。每秒钟闪烁60次的日光灯，你也许根本无法察觉，可是苍蝇却能够不费吹灰之力地看出来。人类对苍蝇眼睛的研究至今，收藏非常丰富。人类对苍蝇眼睛的研究至今，收获非常丰富。美国人根据苍蝇复眼的原理发明了“蝇眼”航空照相机，这种照相机一次能拍摄1000多张高清晰照片。天文学也有一种叫做“蝇眼”的光学仪器，这是一种在无月光的夜晚也能够探测到空气簇射光线的仪器。这种仪器的多镜面光学系统正是根据苍蝇复眼的结构设计的。
　　人的眼睛是球形的，苍蝇的眼睛却是半球形的。蝇眼不能像人眼那样转动，苍蝇看东西，要靠脖子和身子转动，才能把眼睛朝向物体。苍蝇的眼睛没有眼窝，没有眼皮也没有眼球，眼睛外层的角膜是直接与头部的表面连在一起的。
　　从外面看上去，蝇眼表面（角膜）是光滑平整的，如果把它放在显微镜下，人们就会发现，蝇眼是由许多个小六角形的结构拼成的。每个小六角形都是一只小眼睛，科学家把它们叫做小眼。在一只蝇眼里，有3000多只小眼，一双蝇眼就有6000多只小眼。这样由许多小眼构成的眼睛，叫做复眼。
　　蝇眼中的每只小眼都自成体系，都有由角膜和晶维组成的成像系统，有由对光敏感的视觉细胞构成的视网膜，还有通向脑的视神经。因此，每只小眼都单独看东西。科学家曾做过实验：把蝇眼的角膜剥离下来作照相镜头，放在显微镜下照相，一下子就可以照出几百个相同的像。
　　世界上长有复眼的动物可多了，差不多有1／4的动物是用复眼看东西的，像常见的蜻蜓、蜜蜂、萤火虫、金龟子、蚊子、蛾子等昆虫，虾、蟹等甲壳动物都长着复眼。
　　科学家对蝇眼发生兴趣，在于蝇眼有许多令人惊异的功能。
　　如果人的头部不动，眼睛能看到的范围不会超过180度，身体背后的东西看不到。可是，苍蝇的眼睛能看到350度，差不多可以看一圈，只差后脑勺边很窄的一小条看不见。
　　人眼只能看到可见光，而蝇眼却能看到人眼看不见的紫外光。要看快速运动的物体，人眼就更比不上蝇眼了。一般说来，人眼要用0．05秒才能看清楚物体的轮廓，而蝇眼只要0．01秒就行了。
　　蝇眼还是一个天然测速仪，能随时测出自己的飞行速度，因此能够在快速飞行中追踪目标。根据这种原理，目前人们研制出了测量飞机相对于地面速度的电子仪器，叫做“飞机地速指示器”，并已在飞机上试用。这种仪器的构造，简单说来就是：在机身上安装两个互成一定角度的光电接收器（或在机头、机尾各装一个光电接收器），依次接收地面上同一点的光信号。根据两个接收器收到信号的时间差，并测量当时的飞行高度，再经过电子计算机计算，即可在仪表上指示出飞机相对于地面的飞行速度了。
　　现在研究人员还模仿苍蝇复眼光学系统的结构与功能，用许多块具有特定性质的小透镜，将它们有规则地粘合起来，制成了“复眼透镜”，用它作镜头可以制成“复眼照相机”，一次就能照出千百张相同的像来。用这种照相机可以进行邮票印刷的制版工作。

Answer 2

你可以去问蜻蜓，他知道答案

Answer 3

在一只蝇眼里，有3000多只小眼，一双蝇眼就有6000多只小眼。这样由许多小眼构成的眼睛，叫做复眼。 蝇眼中的每只小眼都自成体系，都有由角膜和晶维组成的成像系统，有由对光敏感的视觉细胞构成的视网膜，还有通向脑的视神经。因此，每只小眼都单独看东西。科学家曾做过实验：把蝇眼的角膜剥离下来作照相镜头，放在显微镜下照相，一下子就可以照出几百个相同的像。

Answer 4

The eyes are the eyes of insects, flies, also known as compound eyes. Compound eyes (Compound eye) by a majority composed of small eyes. Complex in the eyes of a small eye surface is generally hexagonal. Small number of eye surface, size and shape variation in a large variety of insects, the male scale insect compound eyes only by the composition of several small round eyes. Housefly's compound eye composed of from 40 small eyes, butterflies, moths of the compound eye of 28,000 small eyes. Small size of the eye surface, not only in different species of insects in different, and different parts of the eyes with a small complex eye surface can also be different, such as male gadfly, a small compound eyes on the back of the eye surface is relatively large; some hair mosquito (Biblio), The front and rear surface of the small size of the eye is different, can be divided into two regions. These changes and their habits and so on. Compound eyes of a fly is composed of more than 4,000 small eyes only, and these little eyes, like the shape of the formation of a cellular accumulation in the fly's head on both sides. Compound eyes of flies can be important for life, flies many parts of the body are directly connected with the compound eye, compound eyes can see the target, the flies immediately dispatched and began a new bad thing. But do not underestimate the compound eyes of flies, they observe the object than we humans have to carefully and comprehensively. The fluorescent flashing 60 times per second, you may simply not be aware of, but the flies are able to effortlessly see it. Human fly eyes of the study, collection is very rich. Human fly eyes of the study, the harvest is very rich. Americans, according to the principle of compound eyes of flies invented the "fly eye" aerial camera, this camera can capture more than 1000 a high-resolution photos. Astronomy is also called "fly eye" optics, which is a night without moon also able to detect air showers of light equipment. This instrument is multi-mirror optical system design based on the structure of the compound eyes of flies.
The human eye is spherical, the fly eye is hemispherical. Fly as the eye can not rotate like the human eye, flies to see things, rely on the neck and body rotation, to the eyes towards the object. Fly eyes are not eye socket, no eyelids and no eye, the cornea is the outer layer of the eye and head directly linked to the surface.
Looks from the outside, fly eye surface (cornea) is smooth, if put it under a microscope, people will find that fly eye is composed of many small hexagonal structure makes up. Each is a small hexagonal small eyes, the scientists call them small eyes. In the eyes of a fly, there are only a little more than 3,000 eyes, a pair of fly eye, there is only little more than 6,000 eyes. This constitutes the eyes of many small eyes, called compound eyes.
Small flies in the eyes of each eye are self-contained, have formed by the cornea and crystalline-dimensional imaging system, there is the light-sensitive retinal cells that make up the visual, as well as the optic nerve leading to the brain. Therefore, each eye individually to see small things. Scientists have done experiments: the fly eye cornea stripped down for the camera lens on the camera under a microscope, and it would be the same as hundreds of lights.
Compound eyes of the world have long animal can be more, almost 1 / 4 of animals is complex seeing things like the common dragonflies, bees, fireflies, beetles, mosquitoes, moths and other insects, shrimp, crabs and other crustaceans have long the compound eyes.
Scientists interested in the eye of the fly is to fly eye has many amazing features.
If the person's head does not move, the eyes can see the range of no more than 180 degrees, the body can not see anything behind. However, the fly's eye can see 350 degrees, you can almost see the circle, only a thin edge of a very narrow back of the head of a small section visible.
The human eye can only see visible light, but was able to fly eyes to see the human eye can not see UV light. Depends on fast-moving objects, even smaller than the human eye the eye of the fly. In general, the human eye can see to use the .05 seconds the contours of the object, and fly eye as long as 0.01 seconds on the line.
Fly eye is a natural gun, ready to measure their flight speed, so in the fast-tracking the target in flight. According to this theory, people developed a measurement of the current relative to the aircraft ground speed of electronic devices, called "aircraft ground speed indicator", and the trial has been on the plane. Construction of this instrument, it simply is: two each in the body angled installation of optical receiver (or in the nose, tail of a loaded optical receiver), followed by the same point on the ground to receive the optical signal . According to two receivers receive the signal time difference and altitude measurement was then calculated through the computer, you can indicate on the instrument relative to the ground plane flying faster.
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Answer 5

天生的