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CLASSIFICATION OF MICROSCOPES
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Hand lens is a simple microscope |
The lens system classification divides
the microscope into simple or compound microscopes. A
simple microscope consists of a single lens or several lenses grouped
in one unit and are only used to enlarge an object. The lens system
ranges from double convex to two plano-convex lenses.
Examples of simple microscopes include reading glasses, jewelry eyepieces,
and pocket magnifiers.
A compound microscope includes
an eyepiece and one or more objectives where the eyepiece
enlarges the resolved image created by the objective. There are a series
of different types of lens within the optic tube. Resolved images
actually enlarge and add detail to the observed object. There are two
types of compound microscopes that use light to observe transparent
(or translucent) and opaque objects. An opaque object requires
light that reflects from the object through the lenses in the optic tube.
This type of microscope is referred to as a "dissecting" or “reflecting"
microscope.
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Principle behind a simple microscope or magnifier
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Under a compound microscope these onion cells can
see more details (resolution). |
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