Question

Relate the formation of rainbow, red sunset and blue sky to the wavelength and frequency of visible light.

Answer 1

Formation of the rainbow occurs when the visible light or white light undergoes refraction and separates into 7 colors which are reflected at various wavelengths.

Red sunset is seen when the red light which has the highest wavelength reflects.

Blue sky is seen as blue light has the shortest wavelength and is dispersed the most.

Explanation:

• Light is made of 7 colors. These light on entering the earth's atmosphere separates due to refraction and reflection.
• Rainbow formation is an optical phenomenon which occurs mostly in the rainy season.
• In the rainy season, water droplets are present in the atmosphere and when sunlight strikes these droplets it undergoes refraction.
• The refracted light then enters the water droplet and undergoes reflection and internal reflection which separates white light into its components of different wavelengths.
• Normally in our atmosphere tiny particles are present and blue light has the shortest wavelength and is scattered and dispersed the most by the tiny particles. So due to these phenomena the sky appears blue.
• During the sunset or sunrise most off the colors of light are dispersed whereas the red light which is having the longest wavelength cannot disperse and reaches our eyes and hence the sun appears red.

To learn more about refraction of light, visit

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