Which of the following phenomena of light are involved in the formation of a rainbow?

(a) Reflection, refraction and dispersion

(b) Refraction, dispersion and total internal reflection

(c) Refraction, dispersion and internal reflection

(d) Dispersion, scattering and total internal reflection



The diagram below shows the formation of a rainbow.

  • White light enters the droplet and is dispersed as it is refracted. 
  • If the light falls at a critical angle (42°) it suffers total internal reflection 
  • It exits the raindrop after being refracted once again.

How is rainbow formed-01.jpg

So, the correct answer is (c)

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo