Analytic Essay


 Background Essay


Method and Materials

Analytic Essay




Lab Report



St. Matt's DEEP site





hellphhThe most important organ to the human being is the eye. The human eyeball is one inch (25mm) in diameter. The eye is able to quickly move its focus from a distant point to a near one. However, it does not see objects, yet sees the light they reflect. The eye can not see when no light is present. Light rays pass through the cornea and into the pupil. The eye changes the rays into electrical signs. These signs are then sent to the brain. The brain interprets them as visual images.
kkkkkkWhen the white card was 50 cm below the water, the light was a constant 4.68 voltage. However, when the white card was replaced by a black card, the voltage was not constant at all. It jumped up and down with a neutral voltage of 3.98. This is quite a bit lower in voltage than the white card. This is because the white card reflects the light and the black card absorbs it. Therefore, relating to vision, a white card at 50 cm is more visible than a black card. At 100 cm, the white card reflected 4.73 voltage. At the same distance, the black card gave us a reading that was about 4.14 voltage. It was 4.11 voltage for white and 4.45 voltage for black at 150 cm. The underwater experiment appeared to be less constant and more inconsistent.

lllllllllllllAbove the water the results greatly differed. At 50 cm the black card was 4.78 voltage and the white card was 4.77 voltage. The white card reflected 4.94 voltage at 100 cm, and the black card was about 4.83 voltage. The white card at 150 cm was about 4.95 voltage and the black was 5.02 voltage. The data above the water between the black and white note cards was more similar compared to below the water.

kkkkkkIn every experiment, there is error. Error is defined as deviating from accuracy or truth, a product of mistake. Although there are amounts of error in every experiment done, our experiment had a large amount of mistakes. First of all, the note cards were laminated, causing the light to not just reflect off the cards, yet the plastic. The black card may not have given off as much light as the sensor picked up, however, it was surrounded by a reflective substance, therefore producing more reflections from the flashlight. Second, the container enclosing the light sensor was not sealed enough, therefore allowing water to seep in. That is why, the results at the beginning of our experiment were more accurate. After a while, the sensor was covered and blocked by the water seeping inside. If we were to redesign the experiment, we would definitely make sure that the container is better sealed, and more reliable. Also, we should have measured the amount of light of the surroundings of the building before our experiment so that we could find the actual results without the surrounding light affecting the sensor. There may not be a way to find the actual results of the reflection of the black card without lamination; however, if we were to redesign our experiment we would try to find out a way.

kkkkkkOur experiment is related to scuba diving because when divers go diving in the night, they often rely on the light to maneuver. Through doing our experiment, we learned that it becomes more difficult to see objects at deeper depths. After analyzing our data, you can also see that the farther away the object is the more stress you put on your vision and the more difficult it becomes to see the object. A scuba diver would not want to count on seeing a light at the surface when at a very large depth. Also, this would not be the case when way above sea level. Do not ever forget your goggles!!!!!!