Ray (optics)
In optics, a ray is an idealized narrow beam of light. Rays are used to model the propagation of light through an optical system, by dividing the real light field up into discrete rays that can be computationally propagated through the system by the techniques of ray tracing. This allows even very complex optical systems to be analyzed mathematically or simulated by computer. Ray tracing uses approximate solutions to Maxwell's equations that are valid as long as the light waves propagate through and around objects whose dimensions are much greater than the light's wavelength. Ray theory does not describe phenomena such as interference and diffraction, which require wave theory (involving the relative phase of the rays).
Read more about Ray (optics): Definition, Special Rays, See Also
Famous quotes containing the word ray:
“How false is the conception, how frantic the pursuit, of that treacherous phantom which men call Liberty: most treacherous, indeed, of all phantoms; for the feeblest ray of reason might surely show us, that not only its attainment, but its being, was impossible. There is no such thing in the universe. There can never be. The stars have it not; the earth has it not; the sea has it not; and we men have the mockery and semblance of it only for our heaviest punishment.”
—John Ruskin (1819–1900)