Concave Mirror with Image and Focus

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“The focus of each point chose may be determined by tracing two rays from the point, and locating their real or apparent intersection after reflection by the mirror. The two rays most convenient for this purpose are teh oen that lies along the axis fo the point, and the one that lies parallel to the principal axis of the mirror.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 338


TIFF (full resolution)

2400×1083, 150.8 KiB

Large GIF

1024×462, 26.4 KiB

Medium GIF

640×288, 15.2 KiB

Small GIF

320×144, 6.6 KiB