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On a sunny day, Krish looked at the sky through a water fountain and was surprised to see a rainbow in the sky.1. The location of the sun when Krish observed a rainbow was :(a) Behind him(b) In front of him(c) Overhead(d) On his left side2. The phenomena of light involved in the formation of a rainbow are :(a) Reflection, refraction, disperation(b) Refraction, dispersion, internal reflection(c) Refraction, dispersion, scattering(d) Dispersion, scattering, internal reflection3. In the formation of a rainbow, the role of water droplets present in the water fountain is to act as a :(a) Glass slab(b) Convex lens(c) Concave lens(d) Prism4. While entering a water droplet the sunlight gets :(a) Refracted only(b) Reflected internally(c) Refracted and dispersed(d) First refracted and then dispersed while coming out of the water droplet |
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Answer» 1. (a) Behind him The sun is directly behind krish. 2. (b) Refraction, dispersion, internal reflection The for motion of rainbow involves all three phenomenon = Refraction, then dispersion and then total internal resolution. 3. (d) Prism Every individual droplet of water acts as a tiny prism that both disperses the light and reflects it back to your eye. 4. (c) Refracted and dispersed When sunlight enters a water droplet, it is refracted and dispersed. |
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