When the atmosphere is not quite clear, one may sometimes see colored circles concentric with the Sun or the Moon. These are generally not more than a few diameters of the Sun or Moon and invariably the innermost ring is blue. The explanation for this phenomena involves:
A) reflection
B) refraction
C) interference
D) diffraction
E) Doppler effect

Question

Quizplus · Accepted Answer

This phenomenon is known as a corona and is caused by the diffraction of light around small water droplets or ice crystals in the atmosphere.

When the Atmosphere Is Not Quite Clear, One May Sometimes