s error. The laws of reflexion at any surface are stated above inSection 23. These are true whatever be the form of thesurface. If the surface how-ever be not plane the directionof its normal is different ateach point, and the determina-tion of the position of theimage formed by reflexion ismore… … 47-48] REFLEXION AT SPHERICAL SURFACES. 85 portion ADC being removed and that light travelling fromright to left falls on ABC. Then ABC is a concave mirror.If on the other hand the outer surface ADC is polished,the light still travelling from right to left, we have a convexmirror; the concave…
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