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| Magnifiers
are used to "magnify" objects. The magnifying power depends on the
focal length of the
lens. The larger the focal length, the less is the magnification.
As the magnification increases , the field of view decreases and
the lens diameter also decreases. |
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| Magnifiers
can be of many types.
A simple plano convex lens is also a magnifier but has a limited
performance capability. It is useful for general viewing and
small magnifications. |
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| Two
lenses with an air space in
between give a slightly better performance in terms of field of
curvature. |
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| Triplet
lenses are preferred for
high magnifications and they give very good performance in terms
of flatness of field, distortion and distortion. They are used
for inspection of very small objects. |
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| Astro
manufacturers simple as
well as compound type of magnifiers. Some of the triplet
magnifiers are shown below. |
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