. The Ontario high school physics. 292 NATURE OF LIGHT; ITS MOTION IN STRAIGHT LINES of considerable size,* such as the sphere S (Fig. 323), tlien itis evident that the only portion of space which recei%es nolight at all is the cone behind the opaque 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 M is a bodyrevolving about E in thedirection indicated. In theposition 1 it is just enteringthe penumbra; in the second position it is entirely within theshadow. If >S represents the sun, E
. The Ontario high school physics. 292 NATURE OF LIGHT; ITS MOTION IN STRAIGHT LINES of considerable size,* such as the sphere S (Fig. 323), tlien itis evident that the only portion of space which recei%es nolight at all is the cone behind the opaque 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 M is a bodyrevolving about E in thedirection indicated. In theposition 1 it is just enteringthe penumbra; in the second position it is entirely within theshadow. If >S represents the sun, E the earth, and M the moon, thefigure will illustrate an eclipse of the moon. For an eclipseof the sun, the moon must come between the earth and the. Fio. 323.—S is a large bright souice, and E anopaque object. The dark portion is the shadow,thie lighter portion the penumbra.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
