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 reflectingbeams 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。