_The Angles of Reflexion and Refraction, lie in one and the same Plane with the Angle of Incidence._
AX. I.
From Opticks: A Treatise of the Reflections, Refractions, Inflections and Colours of Light by Isaac Newton.
From Opticks: A Treatise of the Reflections, Refractions, Inflections and Colours of Light by Isaac Newton.
_The Angles of Reflexion and Refraction, lie in one and the same Plane with the Angle of Incidence._