What focal-length eyepiece should be used

Reference no: EM13694188

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.

Reference no: EM13694188

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