Question

When passing through water droplets while forming rainbow light rays undergo:

• [(i)] Increase in speed.
• [(ii)] Internal reflection.
• [(iii)] Total internal reflection.
• [(iv)] Refraction.

• A. (i) and (ii) are correct
• B. (ii) and (iii) are correct
• C. (i), (ii) and (iv) are correct
• D. (ii) and (iv) are correct

Hint:

Rainbow formation = Refraction + Total Internal Reflection + Refraction

Answer 1

The Correct Option is B

Concept: Formation of Rainbow
A rainbow is formed due to the interaction of sunlight with water droplets involving refraction and internal reflection. Step 1: Entry of light into droplet}
When light enters a water droplet:

• It slows down (not increases speed)
• It undergoes refraction

So, statement (i) is incorrect. Step 2: Inside the droplet}
Light reflects inside the droplet:

• This is internal reflection
• In rainbow formation, it is specifically total internal reflection

So, (ii) and (iii) are correct. Step 3: Exit of light}
Light again refracts when exiting the droplet, but the key distinguishing phenomenon is total internal reflection. Step 4: Conclusion}
Correct statements: \[ (ii) \text{ and } (iii) \]