The Science of Light (Classic Reprint) - Tapa blanda

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Excerpt from The Science of Light

This book is intended as a companion to that on Radiation previously published in this same series, and the first three chapters in that book should be read before commencing this.

Light plays such an important part in the life of man that it is only natural that speculation as to its nature and investigation of its laws should have begun very early. But although this is true, yet the ancients seem to have been exceedingly slow in the invention and construction of optical instruments, and to have been completely innocent of any reasonable optical theory. All the refinements both of construction and theory have happened well within the last three centuries.

Metallic mirrors are, of course, very ancient. Many of them have been recovered from ancient Egyptian tombs, and they are very distinctly mentioned in the books of Exodus and Job. Burning-glasses in the form of globes of water or of glass were also known at a very early time, Aristophanes mentioning them in a comedy of his which was performed in 424 b.c.

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