Question

Colours appear on a thin soap film and on soap bubbles due to the phenomenon of

Answer 1

dispersion of light

this is a phenomenon of splitting of white light into its compound colours.

this is the same happens in rainbow as well as in the soap bubbles.

Answer 2

Answer:

If you blow on the film, the soap solution starts to evaporate and the bubble gets thinner. If you blow gently enough, you can make the colors change slowly from blue or green to yellow and violet, in the exact order you see them in a rainbow (red-orange-yellow-green-blue-indigo-violet).