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Q129 (NDA-I/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

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 :

Explanation

A primary rainbow is formed through a specific sequence of optical phenomena: refraction as sunlight enters the water droplet, one internal reflection at the back of the droplet, and a final refraction as the light exits. This confirms that Statement 1 is correct.

  • Statement 2 is incorrect because refraction alone cannot produce a rainbow; internal reflection is essential.
  • Statement 3 is correct because, when both primary and secondary rainbows are visible, the primary rainbow is the inner bow (lower in the sky) with an angular radius of about 42°, whereas the secondary rainbow is the outer bow (about 51°).
  • Statement 4 is incorrect for a primary rainbow; two internal reflections characterize a secondary rainbow.

Since Statements 1 and 3 are accurate, Option B is the correct answer.

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SIMILAR QUESTIONS

CAPF · 2017 · Q3 Relevance score: 4.72

Statement I : Occasionally we see two rainbows together, the primary rainbow with another less intense secondary rainbow about 10 degrees away Statement I : The secondary rainbow appears due to refraction after a reflection of sunlight from the water droplets

IAS · 2013 · Q65 Relevance score: 1.97

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 1. Dispersion 2. Refraction 3. Internal reflection Select the correct answer using the codes given below.

CDS-I · 2021 · Q103 Relevance score: 0.03

How many internal reflections of light take place in the formation of primary rainbow ?

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Which of the following statements with regard to cloudburst is/are correct? 1. It is defined as sudden localized very heavy downpour with cloud thunder and lightning. 2. It mostly occurs in the hilly areas. 3. It results into very high intensity of rainfall, i.e., 250 mm-300 mm in a couple of hours. 4. It occurs only during daytime. Select the correct answer using the code given below.