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Q.

A rainbow is formed by the combined effects of light ____, refraction, and reflection.

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Detailed Solution

A rainbow is formed due to the combined effect of light dispersion, refraction and reflection.
After rainfall, the tiny droplets of water present in the atmosphere act as a prism for the rays coming from the Sun. Thus, after striking the surface of the droplets, the sunlight gets refracted and dispersed into its seven components, as shown in the figure (figure showing just two components). After this, the light rays are subjected to total internal reflection. Then the rays are again refracted when they come out of the water droplet. Hence, rainbow formation is the combined effect of light's refraction, dispersion, and total internal reflection.
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