可见光是一种电磁波,它的波长很小,只有4.00×10~(-7)m～7.70×10~(-7)m,观察可见光的干涉和衍射现象要比观察机械波如水波的干涉、衍射困难得多,在实验装置,方法和现象观察方面也有特殊的地方,本文以问答的形式,讨论几个有关的问题. 1.在双缝干涉实验中,双缝前为什么还要加一个单缝? 答无论是机械波还是光波发生干涉都要有波源频率相等的条件,除激光器发出的激光 Visible light is an electromagnetic wave, its wavelength is very small, only 4.00 × 10 -7 m ~ 7.70 × 10 -7 m, observing the interference and diffraction of visible light than the observation of mechanical waves such as water interference, diffraction It is much more difficult, and there are also special places in terms of experimental setups, methods and observations. In this article we will discuss a few related questions in the form of questions and answers. 1. Why did we have to add a single slit A Whether mechanical or optical interference occurs must have the same frequency source conditions, in addition to the laser emitted by the laser