A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 364
or the latter having double foci, any object placedin one focus of an elliptic concave mirror will form an accurateimage in the other focus. How will these three things be found related to each other in the thirdcase ? , Why is the image of a distant observer seen indistinctly in a concavemirror ?… … 88. The marginalfigure exhibits a con-venient mode of ar-rangement for pro-ducing optical imagesin the air by meansof a single mirror.-}-Suppose C D to beone side of a room, ora screen dividing onepart of the room fromanother, and havingiu it a square aperture E F, the centre of which may be about…
Physics
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