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NDA 1 2024 GAT, question 129

Topic: Physics

Q129

Which of the following statements with regard to the phenomenon of the primary rainbow formation by water droplets is/are correct ?

  1. It involves refraction and one internal reflection of sunlight.

  2. It involves refraction of sunlight only.

  3. It is formed as the inner bow.

  4. It may involve more than one internal reflection as well as refraction of sunlight.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 1 and 3Correct answer
  3. (c) 3 and 4
  4. (d) 2 and 3

Solution.

Answer: (b) 1 and 3

  1. A primary rainbow results from refraction into and out of a droplet with one internal reflection.
  2. It lies inside the secondary bow.
  3. Thus statements 1 and 3 are correct; two internal reflections produce the secondary rainbow.