Q40.
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:
Answer
D
Explanation
Rainbow formation involves: (1) Dispersion — each water droplet acts as a prism dispersing light; (2) Refraction — since water is denser than air, light refracts as it enters the drop; (3) Internal reflection — some light reflects off the back of the drop when angle exceeds critical angle (48° for water).