lens lab

# lens lab - Kelsey Schur Physics of Music and Color Lenses...

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Kelsey Schur Physics of Music and Color Lenses Lab 11/27/2007 Introduction In this lab, students studied aspects of converging and diverging lenses by arranging them in various ways along an optical bench. To analyze the data gathered by measuring various aspects of each lens set-up, students needed to be familiar with the thin lens equation: 1/f = 1/d O + 1/d I where f is the focal length of the lens, d O is the distance between the lens and the object, and d I is the distance between the lens and the image of the object. The equation to find the magnification of the image cast by the lens was also used: M = |d I /d O | where M stands for magnification. In Part I of the lab, students simply measured the focal lengths of the converging lenses they worked with by setting either the object or image distance as infinite, then using the non-infinite distance to determine the focal length. In Part II, students gathered image and object distance and magnification data; then, they compared it with what they should have found according to the equations and their information from Part I. In Part III, students used a converging lens and a diverging lens together to determine the focal length of the diverging lens. In Part IV, the teams set up the diverging and converging lenses in different arrangements to create a microscope and a telescope. Results Part I lens # d O (cm) d I (cm) f a (cm) 1 - 5 5 2 - 9.5 9.5

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lens # d O (cm) d I (cm) f b (cm) average of f a b (cm) 1 5.7 - 5.7 5.35 2 11.6 - 11.6 10.55 Part II Lens 2 d O (cm) d I (cm) 1/d O 1/d I M exp f M calc = ld I /d O I 35 14.2 1/35 5/71 .489 10.102 .406 15 30 1/15 1/30 2.184 10 2 11.2 78.6 5/56 5/393 7.28 9.803 7.018 17.5 23.4 2/35 5/117 1.509 10.012 1.337 70.5 11.9 2/141 10/119 .289 10.181 .169 Graph is attached. Part III d O (cm) l (cm) d I ' (cm) d I (cm) f d (cm) 29 11.9 15.763 20 11.837 15.1 13.5 15.368 20.15 8.632 13.9 8 14.317 32.1 9.700 57.5 8.3 15.656 24.05 16.957 Discussion Part I First, the teams needed to determine the focal lengths for the two converging lenses they would work with. There were two methods to accomplish this. In the first method, we pointed the lens at a window and focused the image of the window on a screen. The we measured the distance between the lens and the screen to obtain the image distance. The object distance, or the distance from the lens to the image outside the window, was considered to be infinite because it was beyond our means to measure the distance to exactly what we focused on outside. Therefore, the image distance was as long as the focal length. In the second method, we were instructed to project the image of a triangular grid
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## This note was uploaded on 03/29/2008 for the course PHY 10 taught by Professor Gunther during the Spring '08 term at Tufts.

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lens lab - Kelsey Schur Physics of Music and Color Lenses...

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