So that,if it does not pass through the slits,different monochromatic light could not be call "different frequency light",but only could be call"different speed light";
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When you see just one frequency of light, it is disturbing and the eye tries to accommodate itself to the experience and in the process, different tones appear that do not exist in the place.
若你只看到光的某一频率，你会感到恍惚，然后眼睛会努力适应这一体验，而在这一过程中，不同的色调就会产生。
An optical "frequency comb" is a very precise tool for measuring different colors-or frequencies-of light.
光学“频率梳”是一种精确测量光的颜色或频率的工具。
Laser-produced light is different from incoherent light. It is essentially of one frequency.
激光器产生的光与非相干光不同，它实质上只有一个频率。
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