Laurence, Lionel · London, School of Optics · leaf 137
r, one certain position, there is a continuity of one of the lineswithin and beyond the edges of the glass, as in Fig. 131, where the vertical lineA B is continuous. The direction of this line indicates that of the base-apex NEUTRALISATION OF THIN LENSES AND PRISMS 125 plane of the prism, or of the… … C r/ V G\ Aj v~ \ / BFig. 131. D G H the edge of the prism is pointing doivn, and the base is up. If properlymarked, the indicating scratches of circular trial prisms lie over A B when thatline appears continuous through the prism. Neutralisation of Prisms.—The strength of a prism can be learnt…
Optics
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