. Elementary chemical microscopy . Fig. 137. Oil Globule and Air Bubble illuminated with Oblique Light. (Gage.) while in an oil globule the bright disk appears to move in the same direction as the mirror. It thus appears that under oblique illumination the contour bands are heavier or darker on one side of the image of the object than on the other, the particular side which is darker depending upon the difference in the indices of object and mounting medium and the direction of the illuminating rays. Advantage is taken of these facts to determine by means of oblique light whether an object who
. Elementary chemical microscopy . Fig. 137. Oil Globule and Air Bubble illuminated with Oblique Light. (Gage.) while in an oil globule the bright disk appears to move in the same direction as the mirror. It thus appears that under oblique illumination the contour bands are heavier or darker on one side of the image of the object than on the other, the particular side which is darker depending upon the difference in the indices of object and mounting medium and the direction of the illuminating rays. Advantage is taken of these facts to determine by means of oblique light whether an object whose refractive index is sought has a higher or lower index than that of the test liquid in which it is immersed. Oblique
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
