Handbook of optics for students of ophthalmology (1899)
Souter, William Norwood, 1961-1935 · New York, Macmillan · leaf 28
rent position of objects. In the weakerprisms dispersion is not noticeable ; but if an opaque * Prestons Theory of Light, 2d ed., p. 97. 18 HANDBOOK OF OPTICS object be viewed through a prism of considerabledeviating power, it will be tinged with red towardthe apex and with violet toward the base… … Fig. 7. R draw the normals LQMand LRN. Let the angleof incidence PQM be called i, and the angle ofrefraction LQR be called r. Also let LRQ be r\and NRS be e ; then from the law of refraction wehave sin i = n • sin r, and sin e = n • sin rr. Theangle ORQ is equal to 90 — r and OQR is equal to90 — r.…
Eye · Lenses
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