Question

What is rainbow? How it is formed?
a) Primary rainbow
b) Secondary rainbow

Answer 1

Rainbow is an example of the dispersion of sunlight by the water drops in the atmosphere
a) primary rainbow
In primary rainbow, after refraction at the surface of water droplet, the ray suffers one internal reflection & 2 refraction
b) secondary rainbow
In secondary rainbow the ray suffers 2 total internal reflection & 2 refraction.

Answer 2

$\Large\underline\mathfrak{Question}$

What is rainbow? How it is formed?

a) Primary rainbow

b) Secondary rainbow.

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$\Large\bold\star\underline{\underline\textbf{Rainbow\:}}$

Rainbow

→ After rain, when sunlight falls on water drops, concentric coloured arcs are seen in atmosphere. These coloured arcs are called rainbow. It is observed when back of the observer is towards the sun.

Cause

→ Rainbow is formed due to dispersion and total internal reflection of sunlight by water droplets.

Types of rainbow

→ Sometimes two rainbows are seen. The inner rainbow is called primary and outer rainbow is called secondary rainbow.

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$\Large\bold\star\underline{\underline\textbf{Primary Rainbow\:}}$

→ It is formed due to two refractions and one total internal reflection of sunlight by water droplets.

→ In this rainbow red colour is on outer side and violet colour is on inner side of rainbow.

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$\Large\bold\star\underline{\underline\textbf{Secondary Rainbow\:}}$

→ It is formed due to two refractions and two total internal reflections.

→ In this rainbow red colour is on inner side and violet colour is on outer side of rainbow.

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→ An attachment is also provided with the answer to make it clear for you.

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Hope it helped u.

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