When Newton's colour disc rotates fast it appears white,
Mention the phenomenon related to this?

Answer

a) Persistence of vision
'b) When an object is viewed by a person, its image remains in the retina of the eye, for a time interval of 0.0625 s.('1/(16)^s') after
seeing it. This phenomenon is called persistence of vision.
c) When spherical rain drops fall, it appear as glass rods.