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(a) Where does an object need to be placed relative to a microscope for its 0.250-cm...

(a) Where does an object need to be placed relative to a microscope for its 0.250-cm focal length objective to produce a magnification of

−10?

(Give your answer to at least three decimal places.)
  
How are the object and image distances related to the magnification and focal length of a lens? cm (from the objective lens)

(b) Where should the 5.00-cm focal length eyepiece be placed to produce a further fourfold (4.00) magnification?
cm (behind the objective lens)

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