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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 lengthsVirtual Image formed by a convex lens
Data and Calculation:p(mm)q(mm)hi(mm)1/p +1/qf(mm)hi/ho-q/p% difference50011090.01109190.160.214-0.222.67400120130.01083392.310.309-0.33.07300160220.009583104.350.524-0.531.82200210430.009762102.441.024-1.052.551002601050.01384672.222.5-2/64Average = 2.824h0= 42 mmResult:DiscussionQuestions: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.