MikebTelescope

=Telescope Lab= Date of Publication: 3/26/2010
 * Participants**: Mike B, Trevor W, Ryan P.
 * Purpose**: The purpose of this lab is to understand how light waves travel through lenses. Use lenses to magnify an image at a distance very far away.
 * Lab Documents**: --

Next we added a second lense and projected the image to the paper again, adding this second lens flipped the image back so it wasnt upsidedown any more. Finally we built our telescope with 3 lenses. the thirs lense would make the image be reversed again, but we put it closer than 1 focal length to the the previous lens, so that it was used to magnify, not flip.
 * Brief Description of Experiment**: A telescope is a device that uses multiple lenses in an enclosed tube to magnify an image that is many times away from the focal length. Out goal in this experiment consisted using some lenses supplied by Dr. Pasquini to try to build our own telescope. My group (trevor, ryan and myself) used 3 lenses. the first lens had a focal length of 40cm. the second lens had a focal length of 21cm, and our eyepiece had a focal length of 4cm. of using the optics benches most of the time. We started out by making an image that could be projected onto a piece of paper through only 1 lens (like the image Below)
 * Data**: The biggest set of data we collected was a table and graph of the magnification vs focal length of the lens. the lenses that have a longer focal length had a smaller magnification.[[image:telescope_graphhhhhhhhhh.JPG width="826" height="330"]]
 * Sample Calculations:** There were no real calculations in this lab. the biggest thing was being able to find the focal distance of the lenses. you do that by turning off the lights in the room. putting a piece of paper behind the lens and refract an image of the windows onto it. at the distance where the windows were not blurry, thats your focal distance.


 * Results**: i was slightly disappointed in the result of our telescope. the images always seemed to be blurry, and i do not know why. in the center of the eyepiece the image was perfect, but towards the outside it got blurry. and since the center of the telescope was in focus, i dont think the lenses were the wrong distance apart.

//Don't forget to link to your lab report from the lab reports page and to include a link to your lab report in your reflection.//
 * Conclusion**: A good conclusion will include:
 * this experiment produced a reproducible result, but you had to make sure you get your measurements correct.
 * the results differ from actual telescopes, because we did not have proper tools to measure distances very accurately. i think if we were able to measure the focal distance more effectively, we would have gotten a better result.
 * this experiment will be a very good one if you put in the directions that you have to put a tube over youe lenses or else it will not work, we spent alot of time wondering why our image was still upsidedown after we added the second lens. it was because we did not have the tube over the lenses.