Question

Why different colours are seen when kerosene drops on water?

Answer 1

due to reflection and TIR

Answer 2

When it rains, drops of oil float on the layer of water that collects on the road because the density of oil is less than that of the water--the same reason that wood floats on water. ... Because the oil film gradually thins from its center to its periphery, different bands of the oil slick produce different color