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Particles that are small compared with the light wavelength scatter blue light more strongly than red light. Because of this, the tiny gas molecules that make up our Earthâs atmosphere (mostly oxygen and nitrogen) scatter the blue portion of sunlight in all directions, creating an effect that we see as a blue sky. Within the visible range of light, red light waves are scattered the least by atmospheric gas molecules.
This double reflection causes the appearance of the secondary rainbow. The colors of the secondary rainbow are lighter than the primary rainbow because the amount of light that escapes the two reflections is more. Also, the secondary rainbow has more surface area in the sky.When you look closely, there is a dark area of the unlit sky present between the primary and secondary rainbow.his means that the color red which appears on the outside for a rainbow, will be visible on the inside with the blue color on the outside of the double rainbow. It is caused by the reflection of the sunlight inside the raindrops. These raindrops appear at the angle of 50Â° to 53Â°.