Fish watching
You look into an aquarium from the side and you discover a fish. You also watnt o see this fish from above and so you are curious where exactly you have to look at. You are going to test it with the help of three little tubes which are installed above the aquarium. But you know that the rays of light from the fish are refracted at the water surface before they fall into your eye.
Think about the path of the rays of light, emanating from the fish and decide which tube is directed on the position from which the fish can bee seen from above.
Click onto the tube through which the fish is seen or answer the question below the picture.
If you want to see the fish from above, you will have to...
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