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 178
angles at E are rightangles; El = EO; EC is common to the two triangles; hencethe triangle CEI is similar to the triangle CEO. Thenangle i = angle EOC = angle E 1C = angle r. 132. Real and Unreal Images.—If the rays of light pro-ceeding from a point are by any means really broughttogether again at… … FIG. 100. If the rays of light proceeding from a point are by anymeans made falsely to appear to diverge from a differentpoint, as in Fig. 100, then the second point is called anunreal, or virtual, image of the first. A virtual image has 156 PHYSiCS. no real existence in space, and would not show…
Physics
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