What is light upon?

Some articles on light:

Color Temperature - Color Rendering Index
... The CIE color rendering index (CRI) is a method to determine how well a light source's illumination of eight sample patches compares to the illumination ... together, the CRI and CCT give a numerical estimate of what reference (ideal) light source best approximates a particular artificial light, and what the difference is ...
Speed Of Gravity - Lorentz Covariant Models
... greater than c would contradict the concept of local time (based on synchronization by light signals) and the principle of relativity ... we could communicate by signals other than those of light, the velocity of propagation of which differed from that of light? If, after having regulated our watches by the optimal method, we wished to verify the result ... velocity a million times as great as that of light? However, in 1905 Poincaré calculated that changes in the gravitational field can propagate with the speed of light if it is presupposed that ...
Flash - Light
... flash, a single-use source of very short and extremely bright flashes of light Arc flash, an electrical explosion Lightning, a natural phenomenon Muzzle flash ...
Historical Theories About Light, in Chronological Order - Electromagnetic Theory As Explanation For All Types of Visible Light and All EM Radiation
... Faraday discovered that the plane of polarisation of linearly polarised light is rotated when the light rays travel along the magnetic field direction in the presence of a transparent dielectric, an effect ... This was the first evidence that light was related to electromagnetism ... In 1846 he speculated that light might be some form of disturbance propagating along magnetic field lines ...

Famous quotes containing the word light:

    Nature made the day for exercise, work and seeing to one’s business; and ... it provides us with a candle, which is to say the bright and joyous light of the sun.
    François Rabelais (1494–1553)

    The light passes
    from ridge to ridge,
    from flower to flower.
    Hilda Doolittle (1886–1961)