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Write short notes on dark field microsco...

Write short notes on dark field microscope.

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The dark field microscope was discovered by Z. Sigmondy (1905). Here the field will be dark but object wil be glistening so the appearance will be bright. A special effect in an ordinary microscope is broudht about by means of a scpecial component called "Path Stop Carrier". it is fixed in metal ring of the condenser component. patch stop is a small glass device which has a dark patch at centre of the disc leaving a small area along the margin through which the light passes. the light passing through the margin will travel oblique like a hollow cone and strikes the object in the periphery, therefore the specimen appears glistening in a dark background.
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