Alex and Ryan
Analytic Essay

	Our experiment tested the difference of the size of an object on land, to the size of the same object underwater when it is seen through a lens (camera). With an underwater camera we were able to take pictures of an object on land, and then take the same object underwater and take a picture of it (pictures were taken at 4 ft., 6 ft., and 7.5 ft.). After looking on the Internet, we learned that objects underwater appear 33% larger than objects on land. Therefore, our results should show that the objects underwater were 33% larger than the land results. Our results were very close to this. Many times, our results came out the way they were supposed to (water 33% bigger). The farthest off we were to coming up with 33% was 4% more (37% bigger) results. This is very good. The small amount of error in our experiment occurred when we were measuring the object (not during the experiment). It was almost impossible to be exact with our measurements. We could confidently say that our results proved that an object appears 33% larger underwater than on land. 
Our results related to scuba diving. This is because our camera represented the human eye looking through a mask when scuba diving. As our results show, when scuba diving with a mask, all eyesight is magnified 33%. Therefore, if Ryan were scuba diving and thought he saw a 132-foot whale (from its size that it appeared underwater), on land, the whale would appear to be 88 ft long. This kind of tall tale is often referred to by scuba divers as “the fish that got away.” This is because intelligent scuba divers know that the big fish that got away may not have been as big as the person said it was. 
    Our experiment went pretty smoothly. We believe that the design was very well done. If there was one thing we would change, we would have weighted down the wooden board in a much more efficient way. If one looks at our pictures, that person would notice the weights we put on the board were scattered all over in the background. We wish we had evenly distributed the weight on the bottom of the board. 
We have learned a lot. The most important thing we learned was that water changes eyesight. We each had no idea that water made objects appear bigger. But when we finally did, it was not enough. We needed to learn WHY objects appear larger underwater. This is because of light refraction. Refraction is the bending of light that takes place at a boundary between two materials having different indices of refraction. Refraction is due to a change in the speed of light as it passes from one medium to another. * The two mediums in our experiment were air and water. The light slowed down when it moved from air into water. Also, when the light passes through a lens (scuba mask), it refracts even more. When the refracted light meets the eye, the image appears closer, making the object appear to be bigger.  We also learned to get work done as soon as possible and put 100% effort into everything we do. 

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http://www.glenbrook.k12.il.us/gbssci/phys/class/refrn/u14l2a.html
This diagram shows the refraction of light going from the medium of air to the medium of water perfectly. It shows that when the ray of light hits the water (blue line), it does not go straight but slows down and bends (red line). This bend of light is what makes all objects appear bigger to the eye looking through a lens underwater.  
Results_Conclusion.htmlhttp://www.glenbrook.k12.il.us/gbssci/phys/class/refrn/u14l2a.htmlshapeimage_2_link_0shapeimage_2_link_1