Spear Fishing
Science hw. Fishing with spear?
If you're going to catch fish at the river and the only fishing tool you have is a spear. Where would you aim the spear at the fish inside the water ? Above or Below and WHY ?!?
When light passes through air, it travels in a Straight Line. However, when light passes from the air to the water, or water to the air, it is bent, or refracted. When light passes through any two substances of different densities, the light changes speed and is bent.
We think we see exactly where the fish is. Actually, the fish is lower than we perceive. It appears closer to the surface than it actually is. If you put the tip of your spear in the water, it will seem bent.
The secret of spearing fish is to know how much below the image to aim the spear. The fish isn't where you think it is!
The greater the angle (from the vertical) the fish is viewed from, the more the light is bent. Spearing from directly above, the fish will appear to be in the same place, but will appear bigger and closer to the surface than it really is.
picture of it:
http://www.ankn.uaf.edu/publications/Alaska_Science/IMAGES/VERTICAL.JPG
Dolphin Mahi Mahi dorado Pole spear fishing freediving
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