When some are aimed at you, they appear black because they're absorbing most wavelengths of incoming light — but there's no actual opening.

当它们瞄准你的时候，它们看起来是黑色的，因为它们吸收了入射光的大部分——但没有实际的开口。

A white incoming light is therefore scattered not in one direction, but in a number of different directions, sorted by their colors.

一束白色入射光被散射至无数不同的方向，而不是一个方向，按颜色依次排列。

Look at this graph, you can see that the number of photoelectrons emitted increases as the intensity of the incident light increases.

看这张图，你可以看到，随着入射光强度的增，发射的光电子数量也在增。

The ice crystals reflect incoming light from the sun back into space, which has a cooling effect on the atmosphere.

冰晶将太阳的入射光反射回太空，这对大气产冷却效应。

A spectrum is the result when you divide the incoming light from an object into individual colors, or wavelengths.

光谱是当你把从一个物体的入射光分成单独的颜色时产的结果。

It so happens that if you grind a piece of glass into a lens shape, it bends — or refracts — the incoming light in a cone, focusing it into a single spot.

如果你把一块玻璃磨成透镜的形状，它就会使入射光线弯折——者说发折射——而形成一个圆锥型，聚焦到一个点上。

If the energy of the incident photons is less than the work function, no electrons will be emitted, regardless of the intensity of the light.

如果入射光子的能量小于功函数，则无论光的强度如何，都不会发射出电子。

This tries to record not only light intensities, but the direction of incoming light as well.

它不仅记录光强度，而且也记录入射光的方向。

Twinkling happens because the air over our heads is turbulent, and as it blows past, it distorts the incoming light from stars, making them appear to slightly shift position and brightness several times per second.

星星之所以会闪烁，是因为我们头顶上的空气是湍流的，当它吹过的时候，会扭曲来自恒星的入射光，使它们的位置和亮度每秒发几次轻微的改变。

For a camera it's a diaphragm that governs the amount of incoming light.

对于相机来说，它是控制入射光量的光圈。

Spherical reflectors don't perfectly focus all the incoming rays.

球面反射器不能完美地聚焦所有入射光线。

It absorbs about 99.4% of  all the light that hits it.

它能吸收约99.4%的入射光。

In either case, the structures act like a maze for incoming photons.

在任何一种情况下，这些结构都像入射光子的迷宫。

Some of the incoming light, however, will turn into heat.

然而，部分入射光会转化为热量。

I find that when the crystal, zinc blend, is placed so that the incident rays are parallel to an edge of the cube in the crystal, the positions of the spots are to be found by the following simple rule.

我发现，当晶体（闪锌矿）的放置方向使得入射光线与晶体立方体的一条棱平行时，衍射斑点的位置可按以下简单规则确定。

And to build a little intuition, take a moment to think about what would happen if the frequency of the incoming light was something very close to the resonant frequency of this oscillator.

为了建立一些直觉，花一点时间思考一下，如果入射光的频率非常接近这个振子的共振频率，会发什么。

This structure is made from layers of mirror-like cells containing crystals that send incoming light bouncing back towards the photoreceptors and out of the eye.

这一结构由多层镜面般的细胞构成，内含晶体，能将入射光线反射回光感受器并从眼中射出。

And what Penrose says is that, well, what a point in space-time is, is that sphere, that sphere of all the light rays coming in.

而彭罗斯所说的是一点在时空中的意义，就是那个球体，那个包含所有入射光线的球体。

Because, in reality, some of the incident light will reflect off the water’s surface, while the rest of it will go into the water.

因为实际上，一部分入射光会从水面反射出去，而其余部分则会进入水中。

Sentence 76 An eye is a collection of cells that are specialized for light detection through the presence of photosensitive pigment as well as a means of restricting the direction of incoming light that will strike the photosensitive cells.

眼睛由专门探测光源的细胞聚合而成，这些细胞通过使用光敏色素来探测光源，同时眼睛也用于限制射到感光细胞的入射光的方向。