mined bytransmitted light. A mirror M and a condenser C concentrateupon the slide, from below, a beam of light from a window orother broad illuminated area. The set of lenses forming thecondenser are of low grade, for their function is merely toprovide illumination, not to form a clear image of… … Figure 58 single hemispherical lens, hut it is in fact compounded ofseveral distinct units in order to secure chromatic and othercorrections. The eyepiece shown in the figure is what is calledthe Huyghens type, which has certain advantages over theRamsden eyepiece described in connection with…
Light
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