light rays

Color is caused by reflected light rays.

颜色是由反射出的光线引起的.

...the first rays of light spread over the horizon...

地平线上出现的第一缕曙光

To cause ( light rays, for example ) to converge on or toward a central point; concentrate.

使集中,使聚合:使 ( 如光线 ) 集中在一中心点或向中心点集中; 集中.

Light rays are absorbed by black surfaces.

光线被黑面吸收(而无反射).

All disease can be conquered by using appropriately colored light rays.

所有的疾病都可以适当地运用有色的光射线而被征服.

Optical fibers guide light rays within the fiber material.

光纤在其纤维材料中传导光线.

Do light rays travel in the same direction after reflection?

光线在反射后会沿着相同的方向传播 吗 ?

Well, like glasses, contact lenses work by bending light rays just the right amount to make the object come into focus on the retina at the back of the eye.

恩，跟普通眼镜原理一样，隐形眼睛镜片也是适当调整光线射入的角度，以合理的光线容量集中地将物体映射在后眼的视网膜上。

The bending of the light rays is caused by refraction.

光线的弯曲是由折射造成的.

The way a normal mirror works is the light rays bounce off the surface,

普通镜子的工作原理是通过镜面反射，

Focused light rays can set something afire.

聚焦的光线能把某些东西点燃.

The inner surface of the plastic indicating head is made into a polygonal mirror surface, so the direction indicating device which can reflect light rays of various angles is very conspicuous.

塑料指示头内表面制成多棱镜面，能反射各种角度的光线，非常醒目。

Two kinds of convex lens which make parallel light rays converge to the focal point are given.

本文给出两种能使平行光严格聚焦于一点的凸透镜。

Infrared heating is a form of radiation that resembles and behaves like light rays.

红外线采暖是一种辐射式采暖，这种辐射很像光线，其特性也与光线类似。

Rays of light reflect when they meet a polished surface.

光线遇到磨光的表面就会反射.

Therefore, when the endoscope is used for illumination, softer and diffused light rays can exist, when the luminous source is used as the illuminating lamp, better brightness can exist.

据而，在内镜照明时可有较为柔和扩散的光线，而作为照明灯使用有更好的亮度。

What happens to the light rays when they fall on a rough surface?

当光线落在粗糙的表面,反射光会 怎么样 ?

In this case, light rays are focused on a point behind the retina.

在这种情况下, 光线集中于在视网膜之后的点.

All was done as a way of collecting light rays and shadows.

自己睡眠中的眼睛.收集光线和影子.

The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.

只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。