An archerfish spits a stream of water at insects above the water surface to knock them down and eat them. If the fish sees an insect at θ degrees under water, how should the fish aim its spit stream to hit the insect?

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An archerfish spits a stream of water at insects above the water surface to knock them down and eat them. If the fish sees an insect at θ degrees under water, how should the fish aim its spit stream to hit the insect?