在碳弧前面放一个滤光片就可以得到令人满意的近单色光。

A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc.

youdao

在碳弧前面放一个滤光片就可以得到令人满意的近单色光。

A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc.

youdao