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  • free-for-all
  • freeload
  • freeze (someone) out or freeze out (someone)
  • fresh out of (something)
  • frighten (someone) out of his or her wits
  • frighten (someone) to death
  • frighten the living daylights out of (someone)
  • fritter (something) away or fritter away (something)
  • from A to Z
  • from cradle to grave
  • Idioms Quiz
  • crack a book
  • rub elbows/shoulders with (someone)
  • have an in with (someone)
  • back-to-back
  • take on (someone) or take (someone) on
  • nothing to sneeze at
  • once and for all
  • in a world of one`s own
  • put (someone or something) out to pasture or put out (someone or something) to pasture
  • no hard feelings

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  • Simple Science

    How to produce Rainbow Colors

    Color:
    The Spectrum. If a beam of sunlight is admitted into a dark room through a narrow opening in the shade, and is allowed to fall upon a prism, as shown in Figure, a beautiful band of colors will appear on the opposite wall of the room. The ray of light which entered the room as ordinary sunlight has not only been refracted and bent from its straight path, but it has been spread out into a band of colors similar to those of the rainbow.

    Whenever light passes through a prism or lens, it is dispersed or separated into all the colors which it contains, and a band of colors produced in this way is called a spectrum. If we examine such a spectrum we find the following colors in order, each color imperceptibly fading into the next: violet, indigo, blue, green, yellow, orange, red.

    FIG. - White light is a mixture of lights of rainbow colors.


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