Question

7. why do you see the coin when water pured in the trough​

Answer 1

Answer:

When water is poured then it is due to refraction of light the coin becomes visible. ... Therefore, an image of the coin is formed at a smaller depth causing it to be visible (as shown in the figure).

Explanation:

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Answer 2

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When water is poured then it is due to refraction of light the coin becomes visible. When the light rays travel from the water medium (denser) to the air medium (rarer) it bends away from the normal due to the refraction. Therefore, an image of the coin is formed at a smaller depth causing it to be visible (as shown in the figure).