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2: Overview
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Visible Red
Visible Red
Wavelength: 0.6328 micrometers or 0.00000065 meters, about the size of a bacteria
Energy per photon: 2 electron volts
Harmful Effects: Normally harmless, but can cause blindness or burn tissue at high intensity (from the Sun or a laser).

Emitted by:

  • Laser pointers
  • The Sun and other astronomical objects
  • Light bulbs
  • Heat lamps in restaurants (some)

Detected by:

  • Cameras (film or digital)
  • The human eye
  • Animal eyes
  • Plants (chlorophyll absorbs red light)
The Sun
Image courtesy of High Altitude Observatory.
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