Prove that: A rainbow is the combined effect of the refraction,dispersion,total internal reflection of light.
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Answer:
It is formed due to combination of phenomenon like refraction, dispersion and total internal reflection of light. Water droplets act like small prisms which refract and disperse the incident sunlight. Then they reflect it internally and finally again refract it to form rainbow in the sky.
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After rainfall, the tiny droplets of water present in the atmosphere act as a prism for the rays coming from the sun. This, the sunlight after striking the surface of the droplets gets refracted and dispersed into its seven components as shown in picture. After this, the light rays are subjected to total internal reflection. then the rays are again refracted when they come out of the water droplets. Hence, rainbow formation is the combined effect of the refraction, dispertion, and total internal reflection of light.
