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Solve the following problem:

Problem: A standardized biological microscope has a 4.0-mm-focal-length objective.

Part A- What focal-length eyepiece should be used to achieve a total magnification of 200×?

I don't know how to get that answer. Please help! Express your answer to two significant figures and include the appropriate units.

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Category:- Physics
Reference No.:- M91233630

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