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					             Visible Light

                  It’s Visible!

By Hoot Hennessy, Owen Weitzman, and Chris D’agostino
             A Few Details
• Visible light has wavelengths between
  7.5e-7 meters and 4e-7 meters.
• Visible light has frequencies ranging
  between 4e14 Hz and 7.5e14 Hz.
• It fits between Infrared and Ultraviolet light
  on the Electromagnetic Spectrum.
• Visible light is the only light that we can
  see (hence the name “visible”!).
    Some Uses of Visible Light
The primary use of
  Visible light is vision!
  Visible light is the only
  type of light that our
  eyes are responsive
                  More Uses
• Still and motion
  photography both
  depend on visible
  light! Chemicals in
  film react with visible
  light and create an
  image that we can
                   More Uses
• Visible light can also be
  used for spectroscopy.
  This is the measurement
  of what parts of the
  spectrum a certain
  material reflects and
  absorbs. This can be
  used in astronomy to
  determine the chemical
  makeup of far-away
            Even More Uses
• Visible light can be
  concentrated into
  laser radiation, which
  can be used to read
  data from CDs and
  DVDs, as well as
  performing very
  precise surgery, as a
  powerful enough laser
  can cut through
  human flesh.
             And More Uses!
• Without visible light,
  we wouldn’t be able
  to see things on a
  television screen.
• Without visible light,
  reading and sign
  language wouldn’t
  work, because we
  wouldn’t be able to
• Many animals other
  than ourselves can
  see visible light.
  However, there are
  many animals that
  can also see different
  parts of the Electro
  Magnetic spectrum.
    Who Discovered Visible Light?
• Who?
•   Isaac Newton

• When?
•   Summer of 1666

• Where?
•   England

• How?
•   He split light into a spectrum with
        Can it be Dangerous?
• High energy blue light
  can cause damage to
  the eyes, and lead to
• Lasers can burn
  people, but these
  don’t occur naturally.
              Some Facts!
• The color of visible
  light is determined
  by wavelength.
• There are 7
  spectral colors.
• More colors can be
  created by mixing
  visible light of
          Some More Facts!
• Indigo is hard to
  distinguish from
  blue and violet for
  some people.
  Therefore, some
  people don’t think
  that it should be a
  spectral color.
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