Rainbow is formed in the sky by the physical phenomenon of

Explanation:-

Formation of a Rainbow:

A rainbow is formed in the sky due to several physical phenomena involving the interaction of sunlight with water droplets. The key steps include:

1. Refraction: As sunlight enters a water droplet, it slows down and bends because light travels slower in water than in air.
2. Dispersion: The refraction causes the light to disperse into its component colors because different wavelengths (colors) of light refract at different angles.
3. Total Internal Reflection: The dispersed light reflects off the inner surface of the water droplet. This reflection is nearly total, meaning most of the light stays within the droplet.
4. Refraction (again): The light exits the water droplet, and as it does, it bends again. This final bending makes the colors more distinct and forms the visible spectrum of a rainbow.

Given the options, the correct sequence of phenomena involved in the formation of a rainbow is total internal reflection - dispersion - refraction