Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 141
e in the general direction of 3, keeping it,however, about 30 cm. from the glass, until the image of pin No. 1is just hidden behind pin No. 2. Then place a pin at 3, in the samestraight line with the eye, pin No. 2, and the image of No. 1. Draw a fine pencil-line upon the paper close to the glass… … Fig. 89. Fig. 90. certain ray from 1. The line 2-3 shows the course of the same rayafter it leaves the glass at 2. The line NN, Fig. 90, is drawn nor-mal to the refracting surface at the point of emergence. From thispoint equal distances are laid off, to B and to C. Lines are drawnfrom B and from G…
Physics
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