The light spectrum ranges in wavelength from red to violet, and, since the wavelength of the blue light passes through the particles with greater ease than the wavelengths of the other colors of light, the sky appear blue to the naked eye.

• 光谱是按波长由红到紫排列的。 由于蓝色光的波长比其他颜色的光的波长更容易通过大气微粒，所以我们凭肉眼看到的天空呈现蓝色。