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On a rainy day, small oily films on water show brilliant colours. This is due to
1. Interference
2. Dispersion
3. Refraction
4. Polarisation

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Correct Answer - Option 1 : Interference

The correct answer is ​Interference.

  • On a rainy day, small oil films on water show brilliant colors.
    • This is due to Interference. Interference is a phenomenon in which two waves superimpose to form a resultant wave of the greater, lower, or same amplitude.

  • When white light is passed through a glass prism it splits into its spectrum of colors (in order violet, indigo, blue, green, yellow, orange, and red) and this process of white light splitting into its constituent colors is termed as dispersion.
  • Refraction is the bending of a wave when it passes from one medium to another.
    • The bending is caused due to the differences in density between the two substances.
  • Polarization, in Physics, is defined as a phenomenon caused due to the wave nature of electromagnetic radiation. Sunlight travels through the vacuum to reach the Earth, which is an example of an electromagnetic wave. These waves are called electromagnetic waves because they form when an electric field that interacts with a magnetic field. 

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