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a condenser having 2 or 3 lenses with wide aperture for use in microscopes
a condenser having 2 or 3 lenses with wide aperture for use in microscopes
a condenser having 2 or 3 lenses with wide aperture for use in microscopes
a small South American evergreen having coppery bark and pretty foliage
a compound lens system that forms an image free from chromatic aberration