Laurence, Lionel · London, School of Optics · leaf 333
o a screen a highlymagnified real image of, usually, a transparent or translucent qbject such OPTICAL AND OTHEK INSTRUMENTS 321 as a positive, printed from an ordinary photographic negative. The slide,as it is called, is strongly illuminated from behind, and placed just beyondF of a positive lens,… … Fig. 335. Fig. 335 illustrates diagranmiatically the optical princples. L is a power-ful source, such as an electric arc, and G a large compound condenser whichconcentrates a wide pencil of light on to the slide AB placed just outside Fof 0, the objective, BA being the resultant real image. C is…
Optics
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