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An inquiring student makes a refracting telescope by placing an objective lens and an eyepiece at opposite ends of a 47.5 $\mathrm{cm}$ -long tube. If the eyepiece has a focal length of $1.50 \mathrm{cm},$ calculate (a) the required focal length of the objective lens and (b) the angular magnification of the telescope.

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University of Michigan - Ann Arbor

Hope College

University of Winnipeg

McMaster University

So in this problem, the length of the telescope is 47.5 centimeter. The focal length of the I piss is 1.5 centimeter. So in part A, we're going to find the focal length of the objective. And to do that, we're going to use that the length of the telescope is actually the sum of the focal length of the objective and focal length of the pipes. So from here, F or is going to be l minus F E, which is going to be 47.5, minus 1.5. It calls 46 inhibitor now in part B. We want to find out the angular magnification of the telescope. To do that. We just used the definition of the angler magnification, which is F over f e. And we have the value for the boat, which is 46 over 1.5, and this would give me 30 0.67 And that's gonna be the magnification here. I was just ride down 30 approximately

University of Wisconsin - Milwaukee