Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 27
aperture of the object glass is filled with lightdepends on the nature of the illuminating beam. If an objectwhich does not scatter light is illuminated as shown in Fig. 12 (a),the object glass might just as well have nothing but a pinholeaperture; and to make use of the aperture a convergent cone… … Fio. 12. A SIMPLE DESCRIPTION OF THE MICROSCOPE 25 amount of sucli spreading is relatively small and need not beconsidered. If the object is a regular periodic structure, like aseries of dots and lines, tbe spreading due to this cause may bevery considerable, and such an object may not require so…
Microscopy
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