AX. IV.

From Opticks: A Treatise of the Reflections, Refractions, Inflections and Colours of Light by Isaac Newton.

_Refraction out of the rarer Medium into the denser, is made towards the Perpendicular; that is, so that the Angle of Refraction be less than the Angle of Incidence._

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AX. IV.: Opticks: A Treatise of the Reflections, Refractions, Inflections and Colours of Light by Isaac Newton | amphi