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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The upper polar is also called analyzer. This is usually located above the objective lens of the petrographic polarizing microscope and is mounted on a side or pivot to that it can be easily inserted or removed from the optical path. Analyzer is usually constructed of a piece of optical quality polarizing film, although Nicol prisms or equivalent are usually used on many older petrographic microscopes. On some microscopes, the vibration direction of the upper polar can be adjusted. But on other designs, there is no adjustments provided. It is important to note that the vibration of the upper and lower polars are conventionally set so that they are at right angles to each other. The polars are said to be crossed when the upper polar is inserted. Without any material to be viewed on the microscope stage, the field of view is usually dark because the plane polarized light that passes through the lower polar is absorbed by the upper polar. The polars are said to be uncrossed if the upper polar is removed. Alternately, the view through the microscope is with plane light because the light from the lower polar is now a plane polarized light in the absence of the upper polar.



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Wednesday, February 27th, 2008 at 3:44 am
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Polarizing Microscope Resources
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Click Here For Best Selection Of High Quality Polarizing Microscope