The archer fish makes several instinctive calculations in order to catch its prey. These calculations are all to do with refraction from the air to the water. The archer fish must recognize the angle in which it will begin to shoot the water. Then it must calculation the angle of refraction in the air. The target is actually further away than it seems. The fish will have to direct its jet of water further away than the insect seems to be. It must calculate the angle of refraction. This is the angle that the fish must direct its jet of water (instead of straight up towards the target).
The calculations the fish must make are called "Snell's Law".
They look like this:
n1/n2 = Sinθ2/Sinθ1
n = refraction index
Sinθ= The angle of light
The fish instinctively uses this formula to calculate the angle of light in the air. This way it can locate the target's exact location.
The calculations the fish must make are called "Snell's Law".
They look like this:
n1/n2 = Sinθ2/Sinθ1
n = refraction index
Sinθ= The angle of light
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