The bending of the light rays is caused by refraction .
光线的弯曲是由折射造成的。
The optical path difference of two rays in the condition of near axis is discussed in the single spherical surface refraction.
本文讨论了单球形折射面在傍轴条件下二相邻光束的光程差问题。
Due to the refraction of light rays, it is impossible for the naked eye to determine the exact location of a star close to the horizon.
由光线光线会发生折射，因此用肉眼无法确定一颗接近地平线的星星的确切位置。
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