Question

what are the charcterstices to light​

Answer 1

☞ Photography is “writing with light.” So, let's build our conversation about lighting on five fundamental characteristics of light: Direction, Intensity, Color, Contrast, and Hardness.

Answer 2

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Newton proposed the particle theory of light to explain the bending of light upon reflection from a mirror or upon refraction when passing from air into water. In his view, light was a stream of particles emitted from a light source, entering the eye to stimulate sight. Newton's contemporary Christiaan Huygens showed that a wave theory of light could explain the laws of reflection and refraction. In the late 1800s, James Clerk Maxwell predicted, and then Gustav Ludwig Hertz verified, the existence of electromagnetic waves traveling at the speed of light. A complete conceptualization of the nature of light includes light as a particle, as a wave, and as electromagnetic radiation.

The modern view is that light has a dual nature. To debate whether light is a particle or a wave is inappropriate because in some experiments light acts like a wave and in others it acts like a particle. Perhaps it is most accurate to say that both waves and particles are simplified models of reality and that light is such a complicated phenomenon that no one model from our common experience can be devised to explain its nature.

Electromagnetic spectrum

Maxwell's equations united the study of electromagnetism and optics. Light is the relatively narrow frequency band of electromagnetic waves to which our eyes are sensitive. Figure illustrates the spectrum of visible light. Wavelengths are usually measured in units of nanometers (1 nm = 10 −9 m) or in units of angstroms (1Å = 10 −10m). The colors of the visible spectrum stretch from violet, with the shortest length, to red, with the longest wavelength.