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Q.

We can see a rainbow on a sunny day when you look at the sky through a waterfall or through a water fountain_


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a

With the sun in front of you

b

With the sun behind you

c

With the sun overhead

d

Just after the sunset 

answer is B.

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Detailed Solution

We can see a rainbow in the sky if the sun is behind us.
Total internal reflection is a phenomenon in which sunlight enters the drop of water and comes out after total internal reflection. The phenomenon of total internal reflection is behind the formation of the rainbow, and therefore if the waterfall is in front of us, then the sun should be behind us so that the total internal reflection takes place and we can see a wonderful rainbow.
 
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