Primary microscopy and biology. A text book for the use of students in high schools, normal schools and academies (1890)
Schneider, Albert, 1863- [from old catalog] · Fairbury, Ill., The Blade printing office · leaf 17
n order to correct spherical and chromatic aber-ration as will be explained further on. 12 MICROSCOPY. REFRACTION.—(Z., re, back, and frcmgere, to break.) (27) Refraction is the change in direction that a ray oflight undergoes in passing from one medium into another. (2S) The angles of incidence… … (30) In fig. 5 A C is refracted to E and a C to e, so thatAD:EF::ad:ef, then by inversion E F . A D : : e f : a d. (31) This constant ratio is called the index of refraction.It is found by dividing the sine of the angle of incidence bythe sine of the angle of refraction. Let i = index of…
Microscopy · Biology
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