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Q.

Is it true that in the formation of primary rainbow, the sun rays emerge at minimum deviation from rain-drop water after one internal reflection and two refractions?


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a

True          

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Different colours of sunlight have different refractive indexes, so they will be reflected in slightly different directions inside the water droplet and scattered to form a rainbow. After being refracted twice are reflected once by sunlight rays and water droplets that form a primary rainbow and emerge at minimal divergence. A primary rainbow is caused by a reflection inside a drop of water.
 
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