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CHAPTER II.. On Reflexion.

Treatise on Light · Christiaan Huygens — chapter 2 of 12 · ~50 words · public domain

On Reflexion.

Demonstration of equality of angles of incidence and reflexion.

Why the incident and reflected rays are in the same plane perpendicular to the reflecting surface.

That it is not needful for the reflecting surface to be perfectly flat to attain equality of the angles of incidence and reflexion.

Treatise on Light · The Wunder Library — complete classics, free to read, with narration.