Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 203
mal to the surface at its middle point. It is a property of such mirrors that all rays which beforeincidence are parallel to the axis, are after reflection con-verged to a single point, which point is the focus of themirror. Conversely, if the rays radiate from the focus theywill be reflected in… … Fig. 138. of hot iron, and in the focus, m, of the mirror, B, is placedan inflammable substance, as a piece of phosphorus. The (198.) What is a Concave Mirror? What is (heir shape for experiment ? Howaie rays parallel to the axis reflected ? What is the focus? INFLECTION OF HEAT. 201 heat radiating…
Physics
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