光在同种均匀介质中沿直线传播，通常简称光的直线传播。它是几何光学的重要基础，利用它可以简明地解决成像问题。人眼就是根据光的直线传播来确定物体或像的位置的，这是物理光学里的一部分。
... 光源 light source 光的直线传播 rectilinear propagation of light 均匀介质 well-distributed medium ...
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从波动理论出发，证明极限情况下光的衍射结果就是光的直线传播。
Conclusion that result of diffraction of light is rectilinear propagation in limited condition is demonstrated from wave theory.
特别是其中的第三条描述了针孔成像实验，并用射箭的飞行来比喻光的直线传播。
Especially the third one describes the pinhole image formation experiment and analogies rectilinear propagation with the archery flight.
他们抬头仰望，看向群星，发现从广阔的宇宙射来的光线变化轻微，并假定光沿直线传播，或这近乎直线。
They look out into the sky, into the stars, and see a slight variance in light rays that come over the vastness of space, and assume a straight path, or nearly straight.
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