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A standardized biological microscope has an 8.0-mm-focal-length objective.?
What focal-length eyepiece should be used to achieve a total magnification of 100×?
2 Answers
- jacob sLv 72 months ago
For a microscope the magnification is given by;
M = dd{eo}/{fe fo}
where d is the distance of closest distinc vision (approx 250 mm), deo is the distance between the bakc focal plane of the objective and the eyepiece (it is about 160 mm) then fo is the objective focal length and fe is the eyepiece focal length.
then;
100 = {250 x 10^{-3}(160 x10^{-3}/(8 x 10^{-3}fe}
fe = 0.05 m =50mm
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