Q144 / 180 · KCET 2009 · Physics

In fog, photographs of the objects taken with infrared radiations are more clear than those obtained during visible light because

  • A
    I- $R$ radiation has lesser wavelength than visible radiation
  • B
    scattering of $I-R$ light is more than visible light
  • C
    the intensity of $I-R$ light from the object is less
  • Correct answer
    D
    scattering of $I-R$ light is less than visible light

Solution

In fog, visible light is scattered more according to Rayleigh scattering, but scattering of infrared radiations is less due to high wavelengths, hence in fog, photographs of the objects taken with infrared radiations are more clear.

Hence, the correct answer is option: 'D'.

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