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2. File:CRT color enhanced.png - Wikipedia

   en.wikipedia.org/wiki/File:CRT_color_enhanced.png

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3. Geometrical optics - Wikipedia

   en.wikipedia.org/wiki/Geometrical_optics

   As light travels through space, it oscillates in amplitude. In this image, each maximum amplitude crest is marked with a plane to illustrate the wavefront. The ray is the arrow perpendicular to these parallel surfaces. A light ray is a line or curve that is perpendicular to the light's wavefronts (and is therefore collinear with the wave vector).

4. Visible spectrum - Wikipedia

   en.wikipedia.org/wiki/Visible_spectrum

   Evidence indicates that what Newton meant by "indigo" and "blue" does not correspond to the modern meanings of those color words. Comparing Newton's observation of prismatic colors with a color image of the visible light spectrum shows that "indigo" corresponds to what is today called blue, whereas his "blue" corresponds to cyan. [14] [15] [16]

5. Rayleigh scattering - Wikipedia

   en.wikipedia.org/wiki/Rayleigh_scattering

   Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.

6. Caustic (optics) - Wikipedia

   en.wikipedia.org/wiki/Caustic_(optics)

   The caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of rays as a curve of concentrated light. [2] In some cases caustics can be seen as patches of light or their bright edges, shapes which often have cusp singularities .

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8. Electromagnetic spectrum - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_spectrum

   The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and ...

9. Volunteers bring ray of light to Spanish towns shattered by ...

   www.aol.com/news/volunteers-bring-ray-light...

   Some came armed with mops and buckets, pick-axes or shovels, others carried bottles of drinking water and bags of food. Thousands of volunteers of all ages, walks of life and different ...