in a room about 100 yards over that way,

就在路对面大约100码
and the trick it uses is the same one Newton used

它的原理与牛顿
to measure the distance of the air gap for Newton's rings,

测量牛顿环空气间隙的原理一样
or that Hooke explained by the pulses, right?

胡克将其解释为脉冲
And it's interference that comes from scattering.

它是散射造成的干涉
So you've seen oil on water, thin layers of oil on water,

如果你见过水面薄薄的油层
and you see rainbows in them. Why?

你会看到上面五颜六色的这是为什么
Okay, so light comes in and scatters from two surfaces,

光入射后会从两个表面反射产生干涉
that let's say are 200 nanometers apart. Okay?

就认为这两个表面之间距离200纳米
So the path difference between the one that reflects from the top

自上表面反射的光其路径不同于
and the one that reflects from the bottom,

反射自下表面的光
the difference is 400 nanometers;

两者相差400纳米