Question

a man standing on the edge of a swimming pool a fish is swimming towards him from the bottom of the water of the pool how would the man find the fish? faster or slower than its original speed?

Answer 1

Real and apparent depth. The refraction of light at the surface of water makes ponds and swimming pools appear shallower than they really are. A 1m deep pond would only appear to be 0.75 m deep when viewed from directly above. When light emerges from glass or water into air it speeds up again.