Which of the following phenomena of light are involved in theformation of a rainbow?(a) Reflection, refraction and dispersion(b) Refraction, dispersion and total internal reflection(c) Refraction, dispersion and internal reflection(d) Dispersion, scattering and total internal reflection
Question
Which of the following phenomena of light are involved in theformation of a rainbow?(a) Reflection, refraction and dispersion(b) Refraction, dispersion and total internal reflection(c) Refraction, dispersion and internal reflection(d) Dispersion, scattering and total internal reflection
Solution
The formation of a rainbow involves three phenomena of light: reflection, refraction, and dispersion. Therefore, the correct answer is (a) Reflection, refraction and dispersion.
Here's a step-by-step explanation:
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Refraction: When sunlight encounters a raindrop, it is refracted, or bent, at the boundary of the raindrop. This bending of light causes the different colors in the light spectrum to spread out and form a circle of colors.
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Reflection: After refraction, some light is reflected off the inside surface of the raindrop. This reflection causes the light to bounce back towards the other side of the raindrop.
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Dispersion: As the light exits the raindrop, it is refracted (bent) again. This second refraction causes the colors to spread out even more and increases the size of the rainbow.
So, the formation of a rainbow is a result of a combination of these three phenomena.
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