Question

how is rainbow formed???(((class x chapter 11)))

Answer 1

 Dear student,
Rainbow is formed due to following reasons:
Refraction, Dispersion of white light , total internal reflection.
Essential condition for formation of rainbow:
1. Presence of raindrops
2. To view rainbow, sun should be at your back.
Formation:
The rays of sunlight, enter the drop near its top surface. At first refraction occurs , then white light is split up into & colours , violet most deviated and red least.
Reaching the opposite side of drop each colour is refracted back into the drop because of total internal reflection
arriving at the surface of the drop , each colour is again refracted into air.
We observe the rainbow when we view in between 42-20 degrees.

Answer 2

Rainbow is formed due to following reasons:

Refraction, Dispersion of white light , total internal reflection.

Essential condition for formation of rainbow:

1. Presence of raindrops

2. To view rainbow, sun should be at your back.

Formation:

The rays of sunlight, enter the drop near its top surface. At first refraction occurs , then white light is split up into & colours , violet most deviated and red least.

Reaching the opposite side of drop each colour is refracted back into the drop because of total internal reflection

arriving at the surface of the drop , each colour is again refracted into air.