Question

Oil floating on water appears coloured due to interference of light. The approximate thickness of oil for such effect to be visible is

Answer 1

Answer:

Even a very thin film layer of oil on water is enough to exhibit thin film interference phenomenon.

Explanation:

Oil forms layer on the water when it is spread on it as it is hydrophobic and cannot be dissolved in water.

This layer of soil when is exposed to sunlight or white light exhibits different colours due to the phenomenon called thin film interference.