beam of light

名词 beam of light:

1. a column of light (as from a beacon)
   同义词：beam, light beam, ray, ray of light, shaft, shaft of light, irradiation

1. A transparent body of this form, often of glass and usually with triangular ends, used for separating white light passed through it into a spectrum or for reflecting beams of light.
   棱镜这种形状的透明体，多为玻璃制成，通常两端为三角形，用来分解穿过柱体的白光，使光束发生色散或用来反射光线