Due to the refraction of light, the fish is not located at the place you think it is. This applet shows how to find out the real position of the fish.

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Enjoy the fun of Physics! You can access this simulation online from
Where is the fish? (Refraction)
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan