When a ray moves from air into water, the ray’s angle after passing into the water will be less than the incident angle.

当光线从空气进入水中时，光线进入水中后的角度将小于入射角。

When a ray moves from air into water, the ray's angle after passing into the water will be less than the incident angle.

当光线从空气传播到水中时，光线穿过水后的角度小于入射角。

Say you have a flat piece of glass standing on end, and a light ray enters the glass at an incident angle of theta one.

假设您在一侧放置一块平板玻璃，光线以入射角 theta1 进入玻璃。

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。