The fieldof view can be limited by inserting a stop in the focal plane of microscope.
可以在显微镜的焦平面上加装一光阑，从而限制视区。
2
The process of vessel element ' s promotion, formation and connection in primary xylem of antirrhinum majus, a model plant, was observed through micropolariscope and bright - fieldmicroscope.
A lot of submicro copper particles give a golden scattering light with slight pink hue in the dark fieldof optical microscope and a greyish red colour in visual observation.