A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 208
ION OF LIGHT. strictly parts of spherical surfaces. Such lenses possesscertain advantages over spherical-surfaces lenses (see § 170). 160. Definitions Relating to Lenses.—The lenses weshall use will be much like No. 1 in Fig. 131. The twosides are supposed to be just alike. To understand such a… … The straight line HCOCK, continued to any distance ineach direction, is called the principal axis of the lens. Any straight line going, like LM, obliquely through thecentre of the lense is called a secondary axis of the lens. If the two faces of a lens are exactly alike, as we supposethem to be…
Physics
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