Lab 10 report

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Report Sheet OPTICS LAB (LAB 10) EXPERIMENTAL 10A. PLANE MIRRORS Part 1: Parallax 1. Were you successful in determining the location of the paper? If so, what method did you use? If not, what do you think is the reason you cannot locate the position of the paper? If you missed the piece of paper, you in front, behind, to the left, or to the right? I was successful in finding the paper the first time 2. Use the results from steps 6 and 7 (in the lab write-up) to devise a method to locate the position of the piece of paper. Test your method. If it does not work, try to come up with a new method.   Part 2: Image Location 1. What do all of the lines in Step 7 have in common? They all converge on the bolt 2. Where do the lines cross in Step 8? Where the position of the image is 3. In all of the cases where you found the location of the bolt using the method from Part 1, describe the location of the image to the original bolt. Equidistant from the mirror but in the opposite direction 4. Do all observations agree on the location of the image? yes 5. What is the minimum number of lines you need to determine the location of an object? Why?
Two,as the point at which they cross is the location 6. Did your methods of parallax and ray tracing agree on the location of the image? Explain any discrepancies. Ray tracing was a bit more accurate but still mostly agree 7. How do our eyes assume light is traveling? In a straight line   EXPERIMENTAL 10B. EXPLORING MIRRORS 1. Is your image in the convex mirror a virtual image or a real image? How do you know? The image is virtual because the rays traced from the convex mirror will never converge 2. Did the convex mirror give you a good view of a lot of objects to either side of you? Where have you seen mirrors like this used, and what do you think makes them useful? Yees you’ll see these in a funhouse because of the silly distortion or on cars as they provide a lot of visibility 3. When you held the concave mirror close to you, was the image real or virtual? How do you know? The image is inverted but still real because the rays converge 4. How did the magnifications compare for each mirror (i.e. how big was your image in each case)? The concave mirror magnified the image much more than the convex one 5. What happened to your image in the concave mirror as you moved it gradually away?
The image got smaller as the mirror moved away 6. Based on what you observed, estimate the focal length of the concave mirror. Explain your estimation. About 14 cm I put the mirror on a table and moved it back until the focal point   EXPERIMENTAL 10C. DRAWING RAY-DIAGRAMS 1. Use the lens equation to predict the image distance for each case—you will have to rearrange the equation to solve for s i . Remember, f is positive for a concave mirror, negative for a convex mirror, and positive for a converging lens. Write down whether the image is real or virtual in each case. 1a: concave mirror: c = 8 cm, f= 4 cm, so = 10 cm, ho = 4 cm 1b: convex mirror: c = 9 cm, ho = 3 cm, so = 9 cm 1c: concave lens: f = 6 cm, so = 10 cm, ho = 4 cm 1/ sit 1/ so =1/f m= si/so =hi/ho 1a = (1 / si) + (1 / 10) = (1/4); Si = 6.67 cm; Real image 1b = (1/si) + (1 / 9) = (-1/4.5); si =3 cm; Virtual image 1c = (1/si) + (1/ 10) = (-1/6); si =-3.75 cm; Virtual image 2. Measure the distance from the lens to the image on your diagrams—do your predicted image distances match what you got using the lens equation? So =3.33 cm Si= 6.67 cm |S; = (real) * 2 = 2 * 3.33 = 6.66 cm] Yes, my estimated image distances matched.
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3. The magnification for each case is found by taking the image height divided by the object height, or m = h i / h o . For an upright image, m is positive, and for an inverted image, m is negative. What is the magnification in each of your cases? Concave Mirror m = (-6.67 / 10) = (hi / 4), hi = (-2.668 / 4) cm = -0.667; inverted image Convex Mirror: m = (-3/9) = (hi / 3), hi = 1 cm = 1/3 = m = 0.33; upright image Concave Lens: m = -(-3.75/10) = (hi / 4), h; = 1.5 cm, 1.5 / 4 = 0.375; upright image   EXPERIMENTAL 10D. EXPLORING LENSES 1. Did objects appear larger or smaller looking through the concave lens? What kind of image do you see through this lens, and how do you know? Smaller the image was virtual as the rays did not converge 2. Did objects appear larger or smaller looking through the convex lens? What kind of image is this, and how do you know? Large, real because the rays do converge 3. What happened when you moved the lens too far away from the object? Knowing the difference between real and virtual images, explain why you think this happens. It get smaller and blurrier the farther away from the focal point you get 4. What kind of image did you view on the screen in Part 2? I saw an inverted real image 5. Explain why you need the screen to view the image in this case. The screen allows the rays to merge and form the image
6. How is the orientation of the image (right-side-up or upside-down) helpful for determining the type of image? If the image is inverted it is safe to assume it is real since that is the point the rays are converging  

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