Elementary chemical microscopy elementarychemi00cham Year: 1921 ILLUMINATION OF OBJECTS; ILLUMINATING DEVICES 31 When, however, axial reflected light is used, that is, when the illuminating beam strikes the polished preparation normal to its surface, the plane surfaces will appear bright, the irregularities more or less dark, and minute projecting irregular points will Fig. 7. Path of Oblique Light Rays striking an Irregular Surface.

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