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The eyepiece and objective of a miroscop...

The eyepiece and objective of a miroscope, of focal length 0.3 m and 0.4m respectively, are seprarated by a distence of 0.2 m The eyepiece and the objective are to be interchanged such that the angular magnification of the instrument remains sane.What is the new separation between the lenses ?
0.2575 m

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