Question

What is rainbow?
Draw a labell diagram to show the formation of the rainbow Write necessary condition for the formation of rainbow?

Answer 1

Answer:

1. the rainbow is a wonderful 7color image
2. that only see in rain and Sun light appear
3. the rays fall 45 in rain drops then the rainbow appear

Answer 2

A rainbow occurs when light hits the water drops in the atmosphere at a certain angle. It is an atmospheric phenomenon that is formed through optical processes such as refraction, dispersion, internal reflection and secondary refraction.

If the light source is the sun, then the rainbow will be colorful and bright. As shown in Fig. when a beam of sunlight enters the water drop the degree of refraction of the different colors is variable. Violet light has the shortest wavelength therefore, its degree of refraction is also the greatest; red light has a longer wavelength therefore its degree of refraction is the smallest. The degrees of refraction of the other colors lie within this range.

Therefore, a solar halo with violet light in the innermost and red at the outermost edge is formed, and that's why the rainbow we see is always violet on the inside and red on the outside. The visual angle (the angle from the ground surface to the vertex of the rainbow) is about 42 °