Physics
A tank of water is viewed normally from above.
(a) State how does the depth of tank appears to change.
(b) Draw a labelled ray diagram to explain your answer.
Answer
(a) When a tank is viewed normally from above from a rarer medium, the apparent depth of the tank is always less than its real depth.
As aμw = 4 / 3, therefore, the depth of the pond appears three fourth of its real depth on seeing it from air in a nearly vertical direction.
(b) Below is the labelled ray diagram of a tank of water viewed normally from above:
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