So there'll be a modulation

可见角度是关键
as you go out at different angles here, going either up or down

当沿着角度去观察时
it'll be strong, then nothing, then strong, then nothing

就会观察到增强再减弱两者交替出现
strong then nothing. Right?

形成明暗相间的条纹是吧
So now what will determine, what will determine

那么其中哪个因素在起作用?
how frequently these angles recur, at which reinforcement occurs?

什么因素决定波在某个角度增强还是减弱
Is that clear, the question?

我的问题听懂了吗
What determines the angles?

什么决定了增强时的角度?
Yeah.

那位同学
- Pardon me? - The wavelength.

- 再说一遍 - 光的波长
Ah, obviously the wavelength.

嗯显然波长是决定因素之一
What if the wavelength were very, very, very short?

如果波长非常非常短会怎么样?