Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 150
rts of spherical surfaces. Such lenses possesscertain advantages over spherical-surface lenses (see § 147). 137. Definitions Relating to Lenses.—The lenses weshall use will be much like No. 1 in Fig. 101. The twosides are supposed to be just alike. REFRACTION OF LIGHT. 137 To understand such a lens… … The straight line HCOOK, 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 lens 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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