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The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)

Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 306

An illustration from The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies, 1856, leaf 306
. Pour■water into the bowl ; the coin will now become visible, and appear above itstrue position. From the same cause, ponds and rivers often appear to personson their banks less deep than they really are. Such optical deceptions occa-sionally prove fatal to life. What is said of the refracting… … MIRAGE. 301 perfect mirror. The angle at and within which this internalreflection occurs is called the limiting angle between refractionand reflection. This, for water, is 48° 28 ; for sulphur, 30°, and for thediamond, 23° 35. Beyond this limiting angle, the reflectionis total. Thus, if a…

Physics

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