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What is the wavelength of visible spectrum?

  • A.8500 - 9800 angstrom
  • B.7800 - 8000 angstrom
  • C.3900 - 7600 angstrom
  • D.1300 - 3000 angstrom

Answer: C

The visible spectrum runs from about 3900 to 7600 angstrom - 390 to 760 nanometres.

Violet is at the short-wavelength end and red at the long. Below 390 nm is ultraviolet and above 760 nm infrared, neither of which the eye detects.

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