Rainbow is formed due to dispersion of sun light by the suspended water droplets.
Types of Rainbow : Rainbow is of two types (i) Primary Rainbow (ii) Secondary Rainbow
(i) Primary Rainbow : Primary Rainbow is formed due to two refractions and one total internal feflaction of light falling on the raindrops.
In the primary rainbow, the red color is on the convex side and violet on the concave side. Primary rainbow has an angular width of 2° at an average angle of elevation of 41°.
(ii) Secondary Rainbow : Secondary Rainbow is formed due to two refractions and two internal feflactions of light falling on raindrops.
The order of color on the secondary rainbow is in the reverse order and has an angular width of 3.5° at an average angle of elevation of 52.75°. Secondary rainbow is less intense than primary rainbow.
