Snell’s Law says that angles of refraction are determined by the index of refraction for each medium and the angle of incidence.

斯涅尔定律指出，折射角由每种介质的折射率和入射角决定。

And when a ray enters a medium with an increased index of refraction, the angle of refraction decreases.

当具有高折射率的介质光线通过时，折射角减小。

Snell's Law says that angles of refraction are determined by the index of refraction for each medium and the angle of incidence.

折射定律说折射角由每种介质的折射率和入射角决定。

The angle of refraction inside the glass would be less than theta one, since the index of refraction of glass is greater.

玻璃内部的折射角小于theta1，因为玻璃的折射率更大。

The angle of a light ray after it passes from one medium to another is called the angle of refraction, and it’s related to the angle of incidence by Snell’s Law.

光线从一种介质进入另一种介质后的角度称为折射角，根据斯涅尔定律，它与入射角有关。

The angle of a light ray after it passes from one medium to another is called the angle of refraction, and it's related to the angle of incidence by Snell's Law.

光线从一种介质射入另一种介质后的夹角称为折射角，根据折射定律它与入射角有关。

But once the ray reaches the interface between the glass and the air on the other side, it refracts again, and now the angle of refraction is equal to that first incident angle.

但是一旦光线到达另一侧玻璃和空气之间的界面， 它就会再次折射，现在折射角等于第一个入射角。