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# MP4 - -1 Calculate the magnification ImI of the...

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-1: Calculate the magnification, ImI, of the astronomical telescope using equation 4. Compare it with experimental value measured in step V-1. Estimate the uncertainty in your measurement by estimating the range of possible values for the numbers of lines visible when calculating m. = m f1f2 = = 12718 7 = mexp 5 σm 1 -2: Calculate the magnification, ImI, of the terrestrial telescope using equation 4. Compare it with the experimental value measured in step V-2. Estimate the uncertainty in your measurement by estimating the range of possible values for the numbers of lines visible when calculating m. = m f1f2 = = 12718 7 = mexp 5 σm 1 -3: Tabulate the data of step V-3. Add columns for 1/o and 1/I, Using Excel, plot 1/I vs 1/o. From the LINEST function, determine the intercept and the uncertainty in the intercept. Now determine the focal length (and its uncertainty) of the lens combination and report this in the form ± f σf . Calculate the expected value (eqt. 8) and compare it to the experimental value. Does the expected value fall into the range determined by ± f σf ? Use the following lenses : = f1 127mm , = f1 252mm . o(mm) i(mm) 1/o 1/i 110 428 0.009091 0.002336 115 383 0.008696 0.002611 120 326 0.008333 0.003067 125 293 0.008 0.003413 130 272

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