Question

From which of the following locations, a rainbow can be seen as a complete circle?
A. From a very high mountain top
B. From a valley
C. From a sheep in sea
D. None

Answer 1

Hint:In order to solve this question, we have to understand the fact that white color is made up of $7$ different colors which are written as VIBGYOR so when rainfall happens these white colors scatter due to different wavelength and hence different refractive index so different speed and that’s why rainbow is formed. During rainfall rain drops itself act as a prism to split white light.

Complete answer:
To view full circle you must not block the white light of sun that is coming through you falling on raindrop and hence forming rainbow so what you need to have at altitude so that sun rays could not be blocked and you can visualize full circle so only option correct is (A) From a very high mountain so that you can see full circle. Whereas in other options which are from a valley and from a sheep in sea, you are either at earth or at near to earth surface so you are blocking the view of sun and that’s why you only see arcs of rainbow.

Hence, the correct option is A.

Note: It should be remembered that, rainbow can not only be seen in rain it can be seen in winters too because of droplets in air. The only requirement of forming a rainbow is to have a surface having a different refractive index than air so that when white light falls it gets dispersed or splitted in seven different colors. The color spectrum VIBGYOR stands for Violet Indigo Blue Green Yellow Orange Red.