Propagation of Light光的传播
Visible light is a narrow part of the electromagnetic spectrum and in a vacuum all electromagnetic radiation travels at the speed of light: 可见光是电磁谱中的一小部分，在真空中所有电磁辐射都以光速传播：
The above number is now accepted as a standard value and the value of the meter is defined to be consistent with it. In a material medium the effective speed of light is slower and is usually stated in terms of the index of refraction of the medium. Light propagation is affected by the phenomena refraction, reflection, diffraction, and interference. 上述数值现在被接受为标准值，米的定义要与之保持一致。在介质中，光的有效速度会减慢，通常以介质的折射率来表示。光的传播会受到折射、反射、衍射和干涉等现象的影响。
The behavior of light in optical systems will be characterized in terms of its vergence. 光在光学系统中的行为将通过其发散度来表征。
c = 2.99792458 × 10⁸ m/s 光速 ≈ 3 × 10⁸ m/s |
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