-tive and high ocular. Light with central light. The fragmentwill be outlined by a dark band. Put a drop of water at the edgeof the cover-glass. It will run in and immerse the fragment. Theoutline will remain distinct, but the dark band will be somewhatnarrower. Remove the cover-glass, wipe it dry,… … Fig. 99. Section of an air bub-ble and an oitglobule in water (H.20).The air bubble although spherical inform gives only a virtual focus, indi-cated by the dotted lines below the bub-ble. As it is surrounded by a densermedium it acts like a concave lens inair {Fig. /o). The focus of the oilglobule…
Microscopy
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