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 216
5. Formation of the Image in Exercise 28.—The for-mation of the image-points in Exercise 28 is illustrated byFig. 139. One ray from the object-point A follows asecondary axis (§ 160) passing through the centre of thelens, and its direction after leaving the lens is the same asbefore entering it.… … B FIG. 139. through the principal focus, /, on the farther side of thelens. The crossing of these two rays at A shows the posi-tion of the image of A. In a similar way B, the image of B, is located. 166. Size and Shape of Image.—If a straight line isdrawn from A to B in Fig. 139, we may call this…
Physics
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