Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 126
189. How thestereoscope worksFrom Lyndes Phys-ics of the Household,published by TheMacmillan Co. tmpl … optic aervK Fig. 190. Your eyeFrom Black and Davis Practical Phys-ics, published by The Macmillan Co. focused by moving the lensback and forth; but the eye isfocused by changing the shapeof the lens and, therefore, itsfocal length. The muscles ofthe eye make the crystallinelens more convex when we…
Light · Scientific recreations
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