03.Water Opitics
01 Water optical
Whether it is on land on in water. It requires good eyesight for navigating. It propers set the direction to avoid unnecessary dangers to happen. Our eyes have created in order to adapt the air media. When people enter the water. Direct eyes contact with the water will not be able to focused. It turns into 3 to 4 thousand unleashed power of farsighted. Unable to determine the correct distance. Therefore, we must wear the proper swimming goggles when in water. Separate the eyes with water. To create an air space. It allows the eyes to recontact with the water. Restore the original vision on land.
Here we are looking at three different lenses underwater. See what kind of effect they will produce by a simple experiment.
We have arranged three tanks. A spherical surface tank, a flat surface tank, and an arc surface tank. We filled the tanks with clear water. After filled in with water. We have discovered the square has become small through the spherical surface tanks (water optic testing chart). The square has become narrow through the arc surface tank. The square did not have any change through the flat surface tank. Likewise, same as wearing swimming goggles in water. It's the same as looking at the eye chart through the tank. The flatter than lenses are, the more clarity and accuracy to be able to see the square.