Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 303
que sphere E. This is called the umbra, or simjjlythe shadow, while the por-tion beyond it whichreceives a part of the lightfrom >S is the ijenumhra.Suppose M is a bodyrevolving about E in thedirection indicated. In theposition 1 it is just enteringthe penumbra; in the second position it is… … Fio. 323.—S is a large bright souice, and E anopaque object. The dark portion is the shadow,thie lighter portion the penumbra.
Physics
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