A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 290
the direc»tion of the refracted ray-It will be found that therefracted rays ce, dp, &c,diverge very approximatelyfrom the point a, which ison the normal ab, and at adistance from the surface atB such that ab = /* ab. The image formed in thiscase is only approximate, whereas in the former case… … 28a. LIGHT Reflection at a spherical surface. In this and the following casesalso the formation of an image is only approximate, but is suffi-ciently close for most purposes, when the surface does not formtoo large an arc of a sphere, e. g. an ophthalmoscope mirror con-sists of a section of a…
Physics
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