Cow Eye Dissection

This is my blog for dissecting cow eyes .My partner and I are taking it apart step by step. CS

10/28 Period 2

We started off by going over the homework, then we tested to see if the laser can split like in the game. It doesn't split the same way in real life, it was more of a flashlight.



Then we went over how a laser reflects and refracts in a triangular prism, and how a flashlight makes a rainbow when it goes through a prism. We went over what a rainbow was and how white light bent to create one. Certian colors of light slow down more than others so that they seperate and turn into the rainbow. When a second prism is held up to the rainbow it becomes white light again. We saw Newton's model of light going through a prism.

http://www.buzzle.com/articles/color-spectrum-chart.html her is an article with a picture of Newtons theory. GS

Period 2 Triangular Prism Experiment

Today we continued to do the triangular prism experiment we started yesterday.

For the first activity,you have to shine the laser through the triangular prism, you must include:

• a prediction
• test observations/drawing about what you saw
• conclusion

My group's prediction was the light will reflect off everywhere. During our testing, we observed the light went everywhere. Laser beams were everywhere you looked. We concluded the light refracted and reflected off the sides of the prism.

For the second activity, you have to shine a flashlight through the triangular prism, you must include:

• observations
• describe what you saw(facts)
• draw a picture that explains what you saw
• Explain why the thing you saw happens
• Relate it to something(analogy)

My group and I observed that it makes a rainbow.The order of the colors were red,orange,yellow, green,blue, and purple. We also saw shapes on the sides of the triangular prism such as triangles, trapezoid.etc. We described that when shining the flashlight through the triangular prism the light goes to the opposite side of the flashlight and drew how the light rays go through the triangular prism. We explained that the rainbow can be seen because speed changes causing light waves to change causing colors to form. We related this to a rainbow forming after a rainstorm because it goes through same concept. The light goes through raindrops causing the colors of the spectrum to be formed.

To learn more about a rainbow and how its formed go to this website:

http://www.cs.dartmouth.edu/farid/sciencekids/rainbow.html

AR

Today we started out with Finley asking a question, "what would happen if light were to pass through a cube of water, a cube of glass, or a cube of helium?" We had to work and find out what would happen with our groups. After time was up, Fin asked 3 people to go up to the white board and draw out their ideas about the light passing through their assigned cube. The 3 people then sat down and waited for Fin's observation on their drawings. Fin asked other people to explain the drawings, and Fin said that they were all correct. Then he asked why the glass and the water was different. People said that the glass is more dense that water; when it's more dense, it moves toward the normal line. Then, people tried to explain the helium. JP drew that helium is less dense, so the light moves away from the normal line. After the explanations were done, Fin gave us 3 activities. First, he said we were going to experiment wth triangular prisms. We had a normal lazer pointer and a flash light. We had to shine the lights in all directions around the light. But with the flash light, he wanted to shine the flash light going down towards the triangle. We had to obsereve, describe, draw, explain and relate. In the drawings, he wants all the light rays coming out the flash light pic. Finally, we had to take a pen/pencil and put it in a pitcher of water, and draw a pic. of why the ruler was closer; that part was bonus. We then broke into our groups and started the experiment. Right when we start, the fire alarm goes off. The drill only took 3 minutes and we came back in and finally started to work. In my group, we predicted that when we shine the lazer from the top, the lazer will reflect off the sides, and come out the top. When we tested the lazer, our prediction was correct that the lazer would reflect back up, but there were numerous other lazers reflecting out of the triangle. We did a few more tests and recorded our observations. Then the period was over, handed in our materials, and left the room.

WR

We reviewed our hypothesis that light slows down at more dense objects.We also had the hypothesis that light goes towards the normal line when it slows down. We had to talk to our group about our hypothesis. My group(Emily, Claire, Anthony, and I) decided that it will slow down if it goes from a less dense to a more dense material. It was confusing deciding how to test to see if we were right. We concluded that we will take something like water and put a more dense object under it. We will use a protractor to see the angles that they come and go at. Jermey made a good point when he said we should point the laser at the wall with nothing in its way(on an angle), and then put a prism in its way and see how much it bent. I believe that this will be a very good representation for this. We decided to do the experiment multiple times to make sure we have an accurate conclusion. I liked this idea because it will give us an accurate responce. We used a metal rod to keep the laser pointer in place. Then, we marked where the laser was pointing. We then put the prism in its way. We saw it move differently when we move the prism. I think this experiment was a lot easier to set it up and do than I thought. Two points reflected off the prism as well. Only one was on the other side. It went about an inche away from the normal dot. This data supports our hypothesis.

MP

Friday, October 22nd

Our hypothesis from yesterday was that light moves slower in a denser area and faster in a less dense area. We also hypothesized that light is more stretched out when it is fast and it is more condensed when it is slower.

Next, we reviewed the homework from last night. The homework from last night was:

"Construct a prediction of what would happen to a slinky when it moves from a less dense area to a denser area. Then watch the video and say if your hypothesis supports

your prediction."

The video was of a slinky that had 2 parts to it. Half of it was made of a thicker material and the other part was a l

ighter mate

rial. There was a person on both ends of the slinky. First, a person on the right side shook the slinky and the ripple started off very fast, but once it reached the thicker part of the slinky, it slowed down and the ripples became more condensed.

Our prediction was that when the slinky starts off in the less dense area, it should start off straight and then have light, stretched out, ripples. Then when it gets to the denser area, the ripples in the slinky would be more condensed.

The results from the video supported my hypothesis so I may conclude that light travels slower in dense areas and it travels faster in less denser areas. When light travels faster, its waves are more stretched out and when it travels slower, its waves are more condensed.

-J.L.

Friday, October 22nd

Today in science class, we reviewed what we did yesterday first. We discussed the wave model with the slinky and how it moved (the slinky represented light).

fast- more distance

slow- less distance

When light moves faster, it's more stretched out and when it moves slower, it's more condensed.