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Write the expression for magnifying powe...

Write the expression for magnifying power of a telescope in terms of focal lengths.

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The magnification in the case of a compound microscope is `m=(L)/(f_(0))(1+D/f_(e))` whereas in the case of a telescope `m=(f_(0))/(f_(e))` where `f_(0)` is the focal length of object piece and `f_(0)` is the focal length of the eye piece.
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