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.
光沿直线传播，这是众所周知的事。
光还是会沿着直线传播，不会因任何的因素而改变它的存在。我知道，我是存在着。
Light or spread along a straight line, will not change any of the factors that it is there. I know that I exist.
光以直线传播的事实说明了许多事情。
The fact that light travels in straight lines accounts for many things.
光沿直线传播，这是众所周知的事。
光沿直线传播这是毋庸置疑的。
稍加思索，就能理解光总是直线传播的。
With a little reflection, it may be seen that light always travels in straight lines.
稍加思索，就能理解光总是直线传播的。
With a little reflection, it may be seen that light always travels in straight lines.
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