Gilley, Frank M · Boston, Allyn & Bacon · leaf 305
t can be easUy per-formed, however, with a glass plate. Exercise 44. INDEX OF REFRACTION OF GLASS BY PARALLAX. Apparatus: A glass plate, with one of the short edges roughened or ground;a pin in a cardboard support. On the ground edge of the glass make a fineline with ink, as shown in the figure.… … Fig. 275. line. The observer should look in at the edge perpendicularly, throughthe edge opposite the line. Move the head a little from right to left,and change the position of the pin till it moves with the line. Theimage of the line is nearer the observer than the line itself, for theimage is at…
Physics
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