9.503 s (xv) A microscope has an objective of 12 mm focal length and eyepiece of 25 mm focal length. What is the distance between the lenses? What is the magnifying power if the object is in sharp focus when it is 15 mm form the objective?
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Answer:
The magnification of a microscope is given by,
m=
f
o
f
e
LD
where L is the distance between the foci, D is the least distance of distinct vision the other two terms are the focal length of the objective and the eye piece. Substituting the values given,
m=
0.2×4
18×25
Thus, m=562.5
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