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Why does the sea appear blue in colour?

  • A.Reflection of the sun light from water surface
  • B.Interference of the sun light from water surface
  • C.Scattering of the sunlight by water molecules
  • D.Refraction of the sun light

Answer: C

The sea looks blue because of scattering of sunlight by water molecules.

Scattering follows \(I \propto 1/\lambda^4\), so short blue wavelengths are scattered far more than red ones. Water also absorbs red light strongly within a few metres, which deepens the effect.

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