Q. With reference to 22-degrees halo, consider the following statements;
1.A 22-degree halo develops when light enters one side of a columnar ice crystal and exits through another side.
2.It is formed only in the presence of Mid-level Clouds especially Altostratus clouds.
Which of the statements given above is/are correct?
Answer: A
Notes:
Statement 1 is correct: A 22-degree halo develops when light enters one side of a columnar ice crystal and exits through another side.
Statement 2 is incorrect: A 22-degree halo is a ring of light 22 degrees from the sun (or moon) and is the most common type of halo observed and is formed by hexagonal ice crystals with diameters less than 20.5 micrometres.
Halos form when light from the sun or moon is refracted by ice crystals associated with thin, high-level clouds (like cirrostratus clouds).
Source: Telangana Today
