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Which of the following phenomena of light are involved in theformation of a rainbow?

Question

Which of the following phenomena of light are involved in theformation of a rainbow?

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Solution

The formation of a rainbow involves several phenomena of light, including:

  1. Refraction: This is the bending of light as it passes from one medium to another (in this case, from air to water droplets in the atmosphere). When sunlight hits the raindrop, it is refracted, or bent, and then hits the inside surface of the raindrop.

  2. Reflection: After refraction, light is reflected off the inside surface of the raindrop. Some of the light exits the droplet; however, some is reflected back into the droplet.

  3. Dispersion: This is the process by which white light is separated into its component colors. This happens because different colors of light are bent by different amounts when they pass through a medium. In a rainbow, this is why the colors are spread out into a spectrum.

  4. Refraction (again): As the light leaves the raindrop, it is refracted again, which further separates the colors and directs the light to the observer's eye.

So, the phenomena of light involved in the formation of a rainbow are refraction, reflection, and dispersion.

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