Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 156
racted pencil will traverse the path vv^P^ to the left of theeye and parallel to ddj^. The refracted pencil which would enter theeye, for the indicated increased thickness, could only accrue from an in-creased obliquity of the incident axis Ou. The latter would therefore evenmore closely approach… … Fig. 11. This is really proven to be the case by experiment with the prismo-meter. At the distance marked 10 upon the bar, the index-plate-readingnear the base of a 22° prism, 1^ inches square, is found to be 1.79, 148 THE PKISMOMETRIC SCALE. whereas at the feather-edge apex it is 1.89, so that the…
Lenses
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