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Seeing Under Water

Seeing Under Water image
Parent Issue
Public Domain
OCR Text

Vision under water is attended with some peculiar consequences - the result of what is tormed "intemal " rcflcction. An eyc placod under perféctly still Water, as, for instanco, the eye of a diver, will seo oxternal objects only through a circular aperture, as it were, of il( degrees, 55 minutes and 22 seconds ! in diameter overhead. But all tb jee te down to the horizon will be visiblo iu this spacé - those noar the horizon being muoh distorted and contractcd in dimensions, espeoially in height. Beyond the limite of this circle will be seen the bottom of tho water, and all ! subaqueous objects reflected and as vividly depicted as by direct visión ; and, in addition, the circular space above mentioned will appenr surrounded with a rainbow of faint but delicate colors. In the eyes of fishes, the humors being nearly of the refraotive density of the medims in which they i livo, the action of bringing the rays to a focus on the retina is almost entirely performed by the erystalline lens, which is nearly spherical, and of email radius in comparison witli the wliole diameter of the eye.


Old News
Michigan Argus