Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 523
rethe mirror. If a pencil ofsolar rays, SH, ST, parallelto the axis, fall on the mirror, the light is reflected at H and I, on the partswhere the mirror is left exposed, and forms on the screen two brilliant imagesat h and i. By moving the screen MN nearer to or farther from the mirror,a position… … because the triangles FHI and Yhi are similar, HI FA , but HI is half of hi FDhi, and therefore also FA is the half of FD, and therefore AD is equal to 5o6 On Li Hit. [527- AF. Further, FA is the principal focal distance ; for the rays SH and Slare parallel to the axis ; consequently also twice the…
Physics
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