Wright, Mark R., 1854- · London : Longmans · leaf 112
, the section of the reflectingsurface, be small compared with the radius co, it is found,both by measurements and experiments, that all incident rays,SA, TL, X B, ^c, parallel to the principal axis, after reflectionpass though the same point, f, in the principal axis. This pointis midway between c… … Fig. 77. Hold a mirror so that the rays of the sun fall upon it and areparallel to its principal axis. Receive the image upon a small pieceof ground glass. Measure the distance of the bright point (theimage of the sun) from the mirror, this is the focal length. Heat Isalso reflected to the focus,…
Physics
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