Atmospheric Optics

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“BA is the ray of light passing through a rare medium (as, for instance, air); and upon its entrance into a denser medium (as, for instance, water) the ray will be deflected from the direction of its path BA, and will take the course AE. If the line CD is perpendicular to the dividing surface between the two media, then BAC is the angle of incidence and DAE is the angle of refraction.” -Waldo, 1896

Source

Frank Waldo Elementary Meteorology (New York, NY: American Book Company, 1896)

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