From the data of four lenses given in `Q.4` which one will you select as objective of a compound microscope and which one as eye lens ? How can the magnifying power of such a microscope be increased ?
Text Solution
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The objective of a compound microscope should have small focal length and small aperture. Therefore, lens `D` serves as the objective lens. For larger magnifying power, focal length of eye lens should be small (though greater than the focal length of objective lens). Therefore, lens `C` is selected as eye lens. Magnifying power, `m = (L)/(f_(0))(1 + (d)/(f_(e)))` `m = (L)/(5)(1 + (25)/(10)) = (7 L)/(10)` Clearly, `m` can be increased by increasing the length `L` of the microscope tube.
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