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Question 2 (10 Points) Physics 132 students of a local college performed an experiment to determine the focal length of a converging lens. During the experiment, the students placed an illuminated object in front of the converging lens and captured a real image on a screen on the other side of the lens. They tabulated their results as shown in table 1.0 below. They plotted a graph of 1/d, (cm') on the vertical versus 1/do (cm2) on the horizontal axis as shown in figure 2.0. They extended their line of best fit to intercept both vertical and horizontal axes. do (cm) di (cm) 1/do (1/cm) 1/di (1/cm) 0.0333 0.0167 0.0214 40200278 30 35 60 47 0.0250 0.0250 0.0222 45 50 36 0.0200 0.0300 0.0318 31 30 0.0182 0.0167 0.0333 60 Table 1.0-Results of Experiment to Determine Focal Length of a Converging Lens 1/di versus 1/do 0.0600 0,0500 0.0400 0.0300 0.0200 0.0100 o.0000 6083s Figure 2.0-Graph of 1/d, (cm) versus 1/do (cm1) 0.0000 0.0400 Read the vertical intercept on the graph and use it to determine the focal length of the lens. Explain how you used the vertical intercept to find the focal length of the lens. Read the horizontal intercept on the graph and use it to determine the focal length of the lens. Explain how you used the horizontal intercept to find the focal length of the lens. a. b. c. Average the values of the focal lengths found in (a) and (b) above. Question 3 (10 Points) Describe fully the image of an object which is 10 cm high and 28 cm from a diverging lens of focal length 7 cm. a. By using the lens equation. b. Draw a Ray Diagram using graphing paper with an appropriate scale

Answer 1

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