光束

• The aperture allows the desired beam to enter the camera while all other light is intercepted .
  孔可以使所需要的光束进入照相机，而将其余的光线遮挡住。
• In contrast, the axial beam continues to build as it bounces back and forth across the active medium .
  相反，轴向光束则随着往复穿过激活媒质而不断加强。
• Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread .
  无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。
• A small flay, attached to this body, intercepts a beam of light coming from a source and directed to a photocell .
  附在该物体上的光罩截取对着光电管的光束。
• the beam from the laser l passes through the shutter s, is spread by the objective lens .
  激光器L发出的光束经过快门S，被物镜所扩散。
• It diffracts the diffracted beam which effectively means that it generates an inverse transform .
  它对衍射光束再发生衍射，这实际上意味着它产生了一个逆变换。
• The light beam from a laser will not spread out as the beam from a flash light or searching light does .
  从激光中发出的光束不象手电筒或探照灯发出的光束那样扩散开。
• When we were discussing the index of refraction, we saw that an incoming beam of light will make the atoms radiate again .
  在讨论折射率时，我们曾看到入射光束使原子再辐射。
• Because gas lasers were often used as the light source, their beam had to be coupled into the thin-film wave guides .
  由于气体激光器常用作光源，故必须将其光束耦合到薄膜波导中去。
• As the pulsar rotates, this beam sweeps the sky in the same way that a lighthouse beam sweeps around the horizon .
  当脉冲量旋转时，辐射束扫过天空，就像灯塔的光束绕地平面扫视那样。