Answer
As per the figure, after pouring water in 2nd image, we see that due to refraction, image of the coin is formed above the coin and therefore we are able to see more of the coin once we pour water.
Work Step by Step
As per the figure, after pouring water in 2nd image, we see that due to refraction, image of the coin is formed above the coin and therefore we are able to see more of the coin once we pour water.