Question

Oil floating on water looks coloured due to interference of light. What should be the order of magnitude of the thickness of oil layer in order that this effect may be observed?

• A. $10^{-6} m$
• B. $10^{-2} m$
• C. $10^{-10} m$
• D. $10^{-8} m$

Answer 1

Answer: (A)

The order of thickness must be in the order of the wavelength of visible light