Optics is the study of the properties and behavior of light. In this section you can learn about everything from holograms to lasers and lenses.



Purple, a color that is a mixture of red and blue. Purple is a general term that includes specific colors such as violet, Tyrian purple, mauve, and lavender.

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  • Angstrom

    Angstrom, an extremely small unit of length that is used primarily in expressing the wavelengths of visible light. See more »

  • Binoculars

    Binoculars, optical instruments consisting of two small telescopes mounted side by side, one for each eye, and a focusing mechanism. See more »

  • Black

    Black, the lack of color. When light strikes an object, all light waves are absorbed except those of the color of the object. See more »

  • Blue

    Blue, one of the primary colors. Minerals such as turquoise, azurite, labradorite, and lapis lazuli are blue. See more »

  • Brown

    Brown, a color. It is a mixture of red and yellow, with some black. Brown is a common color in nature. See more »

  • Diffraction

    Diffraction, in physics, the spreading out of waves, such as those of water, sound, radio, or light, as they pass around an obstacle or go through an opening. See more »

  • Diffusion (optics)
    Diffusion (optics)

    Diffusion, in optics, the scattering of light, as when it is reflected from a rough surface or when it passes through a translucent material. See more »

  • Gray

    Gray, or Grey, any color formed by blending black and white. Gray tones range from nearly white to nearly black. See more »

  • Green

    Green, a color of the spectrum that appears between blue and yellow. Green is a primary color of light. See more »

  • Halo

    Halo, a circle or arc of light surrounding a luminous body. The name is particularly applied to the luminous circles sometimes seen around the sun or moon. See more »

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