Question

Three phenomenon of light responsible for formation of rainbow in the sky

Answer 1

refraction
reflection(internal reflection)
dispersion

Answer 2

Three phenomenon of light responsible for

#formation of rainbow in the sky are
dispersion (the splitting of white light into seven colours on the passing through a medium )

#refraction ( the change in direction of light when it's passes from one medium to another)

#total internal reflection

hope its help you