Question

The combination of which of the following processes results in the formation of a rainbow?

• Dispersion and Total Internal
• Reflection
• Dispersion and Absorption
• Refraction and Scattering
• Dispersion and Focussing​

Answer 1

Answer:

Rainbow is formed due to dispersion and total internal reflection of sunlight by raindrops.

Answer 2

Answer:

The Correct Answer is Dispersion and Total Internal Reflection. Rainbow is formed due to Dispersion and Total Internal Reflection of Sunlight which comprises of Seven Colours.

Explanation:

1. When the some parts of Sunlight which have their incident angle greater than the critical angle for air-water surface falls on the water droplets caused by rain, they undergo Total Internal Reflection phenomena, means they are reflected back into the same medium i.e., water.
2. After getting reflected, they travel again from denser to rarer medium i.e., water to air. Here they show Dispersion phenomena i.e, the sunlight gets divided into it's constituent monochromatic colours, VIBGYOR.

Hence, we are able to see 7 colours Rainbow.