Speed of light Main article: Speed of light The speed of light in a vacuum is defined to be exactly 299,792,458 m/s (approx.Certain chemicals produce visible radiation by chemoluminescence.As in the case for radio waves and the X-rays involved in Compton scattering, physicists have noted that electromagnetic radiation tends to behave more like a classical wave at lower frequencies, but more like a classical particle at higher frequencies, but never completely loses all.

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The refractive quality of lenses is frequently used to manipulate light in order to change the apparent size of images.Many animals with eyes that do not require lenses (such as insects and shrimp) are able to detect ultraviolet, by quantum photon-absorption mechanisms, in much the same chemical way that humans detect visible light.Light is at once both obvious and mysterious.

450 bce) seems to have developed a model of vision in which light was emitted both by objects and the eye.Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 1011 metre to radio waves measured in metres.