Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 375
ncreasing density, and to an eye at the earths surface appears to come from a point A in the heavens. The general effect of the atmosphere on the path of light that traverses it is such as to increase the apparent altitude of the heavenly bodies. It Fig. 263. enables us to see a body (B) which is… … Exercises. 1. Draw a straight line to represent a surface of flint glass, and drawanother line meeting this obliquely to represent a ray of light passingfrom a vacuum into this medium. Find the direction of the ray after itenters the medium, employing the index as given in the above table. 2. a.…
Physics
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