So, when reflecting off of flat water, the reflected ray becomes partially, horizontally polarized.
因此,当从平坦的水面反射时, 反射光线会变成部分水平偏振。
Crash Course Physics 速成课物理
And if a light wave is horizontally polarized, then it won't be able to pass through the slit.
如果光波是水平偏振的, 那么它就无法通过狭缝。
英语百科
Polarization (waves)
Polarization (also polarisation) is a property of waves that can oscillate with more than one orientation. Electromagnetic waves such as light exhibit polarization, as do some other types of wave, such as gravitational waves. Sound waves in a gas or liquid do not exhibit polarization, since the oscillation is always in the direction the wave travels.