Question

Why objects seem large underwater?

Answer 1

Here is your answer :-

Objects seem large underwater due to refraction of the light . When Light travel from air to water , it gets refract . So objects seem large underwater .

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Answer 2

Since air has an index of refraction of essentially 1 and water has an index of refraction of 1.33 the angle from which the rays of light reach your eyes is larger than the angle they would in air. This makes the angular size larger to your eyes which makes the object look larger relative to how they would look in air.