The researchers used a machine called an "electroretinogram" to test the field of vision - firing a tiny beam of light at the shark in a darkened tank from all directions.

研究人员利用“网膜电图”机测试视野——在一个黑暗的箱子里从各方位向鲨鱼发射一丝微弱的光。

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A light beam shot through a blob of rubidium atoms can directly and reliably measure the size and orientation of a magnetic field, a team of physicists reports in the Sept. 13 Physical Review a.

9月13日，据一个物理学家小组在物理学评测A中的报道，一束光照射过一团铷原子就可以直接可靠地测量出一个磁场的大小和方向。

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Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.

衍射理论的另一个重要应用就是研究准直光束的远场发散角。

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At dawn, he could see that but for the roadside oaks everything was gone, burned off the face of the earth as if by a powerful beam of light, the house standing naked and singed in a field of white ash.

NEWYORKER: Idols

They used a beam of photons to measure the small magnetic field produced by a gas made up of a million ultra-cold rubidium atoms.

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In an atmosphere of deuterium gas, the field generated positively charged deuteron ions and accelerated them to high energy in a beam.

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