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2: Overview
Main Menu > 2: Energy From The Sun > EM Spectrum Cards > Visible Blue  
Visible Blue
Visible Blue curve
Wavelength: 0.4358 micrometers (blue of Mercury street light)
Energy per photon: 2.8 electron volts
Harmful Effects: Normally harmless, but can cause blindness or burn tissue at high intensity (from the Sun or a laser).

Emitted by:

  • Blue laser diodes
  • The Sun
  • Light bulbs
  • Astronomical objects
  • Lightning

Detected by:

  • Cameras (film or digital)
  • The human eye
  • Animal eyes
  • Astronomical instruments, including telescopes


Astronomical instruments
A Large Binocular Telescope. Image courtesy of ADS International Srl.
and Max-Planck-Institut fuer Astronomie.
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