Background Info

 Background Information

 Analytic Essay

 Diagram

 Link

 Enhancements

 Back to Title Page

 Lab report

 Results

 Photographs

 Animation

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 To St. Matthew's Deep Page

Background Essay

Our eyes rely on light for vision. The lens in our eye focuses light reflected by objects onto our retina. Which, in turn, sends the image to our brain. This is much like the way a camera works.

This is important underwater. As you have surely observed, there is much less light at depth. The water at the surface first refracts the light. This means that the light's course is altered. Light is then scattered underwater. The scattering of light underwater is what we will mainly be observing. Light is scattered in different directions by water molecules and impurities in the water. Light is also "absorbed" by the water and lost. It is this refraction, absorbing, and especially scattering that makes the light lose its intensity.

So light loses intensity as it goes through water. Since our vision relies on light, when the amount of light decreases around us, we cannot see as well. At depth, the lack of light reduces your ability to see. You can't see as far and most colors fade. Color is a useful way of identifying things so special masks and/or artificial lighting would therefor be useful. We are going to measure how much light is lost in several different types of water. By different types of water we mean water with various amounts of impurities.

More Information on Eyes

 Background Information

 Analytic Essay

 Diagram

 Link

 Enhancements

 Back to Title Page

 Lab report

 Results

 Photographs

 Animation

 Bibliography

 To St. Matthew's Deep Page

http://www.imagif.net/Back/Water/index.html