Rainbows

RAINBOW

How beautiful that is One of the exiciting and glorious phenomenon of nature is  chromatic dispersion known as rainbow.

It is very exiciting to know that what is the principle works behind it-lets's know about it---⇛

When sunlight (which consists of all visible colors) is intercepted by a falling raindrop some of the light refracts into the drop, reflects once from the drop’s inner surface, and then refracts out of the drop.

and thus when the rays of sunlight are horizontal the first refraction separates the sunlight into its component colors.

VIBGYOR.        

There is an another second refraction which increases the separation. ( Only the red and blue rays )

The separated colors they produce when the drops are at an angle of 42°.

Because every  drop at an angle of 42° in any direction can contribute

to the rainbow, the rainbow is always a 42° circular arc.

Geomatry of rainbow

And the top of a rainbow is never more than 42° above the horizon.

Because rainbows formed in this way involve one reflection of light inside each drop,they are often called primary rainbows. 

A secondary rainbow involves two reflections inside a drop.

Secondry reflection

 Colors appear in the secondary rainbow at an angle of 52° from the direction of A.

A secondary rainbow is wider and dimmer than a primary rainbow and thus is more difficult to see.

Also, the order of colors in a secondary rainbow is reversed from the order in a primary rainbow.

****Rainbows involving three or four reflections occur in the direction of the Sun  cannot be seen against the  sunshine in that part of the sky.

Hope you have learnt something interesting and new from this article in easiest way.

If so then do comment,and share it 📲📲 with your friends🤼 and👨‍👨‍👦‍👦 family members.

Thanks!
@Jeewan

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