# Converging Lenses and The Eye as an optical instrument -...

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Converging Lenses and The Eye as an optical instrument Oseas Medina Christopher Kendl 12/06/2016 Physics 123
( Part a) Objective The purpose of this lab is to observe the location and size of the image produced by a converging lens. We will be applying the index of refraction and the fundamental lens equation to determine the location and magnification of the image. Objective The purpose of this lab is to determine the size and location of the image produced by our set up. We are to use the index of refraction and the Fundamental Lens Equation in order to determine the location and magnification of our image. Equipment Optics Bench 75mm Focal Length Convex Lens Component Holders (3) Light Source Crossed Arrow Target Viewing Screen Procedure 1. Set up the equipment as shown in the figure in your lab manual. 2. Turn on the light source and slide the lens toward or away from the Crossed Arrow Target, as needed to focus the image of the target onto the viewing screen. Procedure Questions 1. reduced 2. yes 3. D i would decrease 4. (done below) 5. Yes, if you take into consideration the small error in measurement 6. When d o was 75mm and 50mm the image projected was far too large to measure Data Data Calculations D o (mm) D i (mm) H i (mm) 1 d i + 1 d o 1 f h i h o d i d o 500 92 4 0.0129mm 0.0133mm 2 -0.18 450 95 5 0.0127mm 0.0133mm 2.5 -0.21 400 97 6 0.0128mm 0.0133mm 3 -0.24 350 101 7 0.0128mm 0.0133mm 3.5 -0.29
300 103 8 0.0130mm 0.0133mm 4 -0.34 250 108 10 0.0133mm 0.0133mm 4.5 -0.43 200 120 14 0.0133mm 0.0133mm 6 -0.60 150 152 25 0.0132mm 0.0133mm 9.5 -1.01 100 323 75 0.0131mm 0.0133mm 21 -3.23 75 N/A N/A 50 N/A N/A Discussion IN this lab we were able to observe how images are reflected through a converging lens. Once we observed the distance of the object, image and the height of the image, we were able to calculate, using the fundamental lens equation, the height of the object and the focal length. Our calculations showed that di and do are inversely related and that as the object distanced was decreased the magnitude of said image increased. However we were unable to provide any data for the 50 and 75 mm distances as the images projected were too large to measure. Questions: 1. If the d o =d i there would be a magnification of 1.