Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 353
es the more light, and dark on a light background ~ on the side which receivesless light; but the spot be-comes nearly invisiblewhen both sides are equal-ly illuminated. Draw astraight chalk line acrossa table, aiul place at rightangles to this line a row of four lighted candles, and on the… … i^iiofoMETEif. 33l light that the other does. Move the row of lights slowly away fromthe paper, or move the single light toward the paper, and a point willbe fomid in either case where the spot will nearly disappear. What isthe position of the paper with respect to the two sources of light whenthis…
Physics
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