Rainbow is formed due to – (a) only reflection (b) dispersion and total internal reflection (c) diffraction (d) scattering

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Rainbow is formed due to dispersion and total internal reflection. The separation of a white light ray into its individual hues when it strikes a prism is a process known as light dispersion. The spectrum of a light beam refers to the range of its color components.

Formation of Rainbow

  • After a rainstorm, a rainbow is a natural spectrum that appears in the sky.
  • It is brought on by the atmosphere’s microscopic water droplets scattering sunlight.
  • A rainbow will always form in the opposite direction from where the Sun is.
  • The water droplets perform the role of tiny prisms.
  • The incident sunlight is first refracted and dispersed, then refracted internally, and then refracted once more when it emerges from the raindrop.
  • Different colours are visible to the observer’s eye as a result of light dispersion and total internal reflection.
  • Total internal reflection means that none of the light that might conceivably travel away from this surface is refracted and that all of it is reflected.
  • Therefore, choice 2 is accurate.


Rainbow is formed due to – (a) only reflection (b) dispersion and total internal reflection (c) diffraction (d) scattering

Total internal reflection and dispersion combine to create a rainbow. Light dispersion is the mechanism by which a white light ray splits into its individual colours as it enters a prism. The range of a light beam’s colour components is referred to as its spectrum.

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