spot lens (0 synonym found)

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Definition of spot lens:

(n) : (microscopy) A condensing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the "spot"), and used in darkfield illumination.
Definition of spot lens:

(n) : (microscopy) A condensing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the "spot"), and used in darkfield illumination.
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