Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 41
ances from the light source to thelens and the image to the lens. In the upper diagram L 0 ishalf L S, and the image is half the size of the luminous source ;in the lower diagram L 0 is one-quarter L S, and the image isone-quarter the size of the luminous source. The lens does notonly collect a… … FiG. 27. ILLUMINATING APPAKATUS 39 centrated and brilliant small patch of light which is made useof for the illumination of opaque objects viewed with lowpowers. Fig. 28 shows the Beck electric lamp used with a bulls- oondensereye condenser in this manner for condensing a powerful beam ^°of light…
Microscopy
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