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Consider the following statement: a) The inner edge of primary rainbow is violet. b) The inner edge of secondary rainbow is violet. c) The primary rainbow is brighter than secondary rainbow. d) The secondary rainbow is brighter than primary rainbow. Which of the above statements are correct?

Consider the following statement: a) The inner edge of primary rainbow is violet. b) The inner edge of secondary rainbow is violet. c) The primary rainbow is brighter than secondary rainbow. d) The secondary rainbow is brighter than primary rainbow. Which of the above statements are correct? Correct Answer Both a and c are correct

CONCEPT:

  • Dispersion of light: The phenomenon in which a white light ray when falls on a prism get separated into its component colors is called dispersion of light.
  • Primary rainbow: Primary rainbow is the result of One Total internal reflection and two refractions from the suspended raindrop.
    • Violet color forms on the inner edge and red color on the outer edge. Angles subtended with the direction of the sun are 42˚ (red) and 40˚ (violet) above the horizon.
    • The primary rainbow is a result of a three-step process, that is, refraction, reflection, and refraction.

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  • Secondary Rainbow: Secondary rainbow is the result of two total internal reflections (TIRs) and two refractions from the suspended raindrop.
    • In this rainbow red color appears on the inner edge while violet color appears on the outer edge which is reverse of that of the primary rainbow.
    • This is because of additional reflection which causes a 180˚ phase shift.

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EXPLANATION:

  • The primary rainbow is brighter and narrower, having its inner edge violet and the outer edge red.
  • The secondary rainbow which is comparatively fainter has inner edge red and outer edge violet.
  • So statement a and c are correct. Hence, option 1 is correct.

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