A corona around the moon is seen when we view it on a fogy or misty night. This is due to:

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AAI ATC Junior Executive 2015 Official Paper (Shift 1)
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  1. Diffraction patterns of air born water droplets
  2. Dispersion of light by air born water droplets
  3. Scattering of light by air born water droplets
  4. Formation of diffused image of moon

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Option 1 : Diffraction patterns of air born water droplets
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Explanation:

AAI ATC 2015 Part2 Satya images Q13

  • A corona is an optical phenomenon produced by the diffraction of sunlight or moonlight by individual small water droplets and sometimes tiny ice crystals of a cloud.
  • Corona consists of several concentric, pastel-colored rings around the celestial object and a central bright area called aureole.
  • The aureole is often (especially in the case of the Moon) the only visible part of the corona and has the appearance of a bluish-white disk which fades to reddish-brown towards the edge.
  • The angular diameter of a corona depends on the sizes of the water droplets involved; smaller droplets produce larger corona.
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