Why does a swimming pool appear to be shallower than its Actual Depth?
Kindly refer to the link given below for an answer to a similar query :
https://www.meritnation.com/ask-answer/question/water-in-swimming-pool-or-water-tank-appeas-shallower-than-i/wonders-of-light-part-ii/8473019
https://www.meritnation.com/ask-answer/question/water-in-swimming-pool-or-water-tank-appeas-shallower-than-i/wonders-of-light-part-ii/8473019