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The two people referred to are David Brewster and Isaac Newton.

David Brewster intensively studied absorption spectroscopy. These researches led him to dissent from Newton's doctrine of colors and to affirm a "Newtonian" emission theory of light.

By 1831 he had determined that the light spectrum "consists of three spectra of equal length, beginning and terminating at the same points, viz. a red spectrum, a yellow spectrum, and a blue spectrum."

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5mo ago

Brewster-Newton theory, named after Sir David Brewster and Sir Isaac newton, is a concept in optics that explains the phenomenon of polarization by reflection. It states that when light strikes a surface at a specific angle known as the Brewster angle, the reflected light becomes completely polarized parallel to the surface. Brewster's Law mathematically relates the Brewster angle to the refractive indices of the two media at the interface.

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