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Q.

Is it true that if a coin is kept at the bottom of an empty bucket, a person standing near it cannot see it, on pouring some water into it, it becomes visible to that person, this is due to refraction?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
When the coin is underwater, due to the refraction of light, a virtual image of the coin is formed, slightly above its actual position nearer to the water's surface. Hence, the coin becomes visible again by pouring some water into the bucket. There is a change in the medium. This is due to the refraction of light.
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