Measure the image distance and the image height 4 Record the image distance q

# Measure the image distance and the image height 4

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Measure the image distance and the image height. 4. Record the image distance, q, and height,h , in the data table. Calculate the focal length and magnification, and record these. 5. Repeat for other object distances. 6. Find the % Difference between the experimental and theoretical focal lengths Virtual Image formed by a convex lens
Data and Calculation: p(mm) q(mm) h i (mm) 1/p +1/q f(mm) h i /h o -q/p % difference 500 110 9 0.011091 90.16 0.214 -0.22 2.67 400 120 13 0.010833 92.31 0.309 -0.3 3.07 300 160 22 0.009583 104.35 0.524 -0.53 1.82 200 210 43 0.009762 102.44 1.024 -1.05 2.55 100 260 105 0.013846 72.22 2.5 -2/6 4 Average = 2.824 h 0 = 42 mm Result: Discussion Questions: 1.Find the average focal length, and the % Difference between the average 2.Why could you not obtain a focused image for some object distances?
3.What would the object distance need to be in order to obtain a magnification of -1? 4.For a converging lens of focal length f, where would you place the object toobtain an image as far from the lens as possible? 5.If you have a focused image for a converging lens of a slide projector and you move the viewing screen toward the lens, which way should you movethe lens in order to restore the image to a sharp focus? Explain.