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Recreations in Astronomy - With Directions for Practical Experiments and Telescopic Work by Henry White Warren
page 41 of 249 (16%)
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Across the astronomic spaces reach all these powers, making creation
a perpetual process rather than a single act. It almost seems as
if light, in its varied capacities, were the embodiment of God's
creative power; as if, having said, "Let there be light," he need do
nothing else, but allow it to carry forward the creative processes
to the end of time. It was Newton, one of the earliest and most
acute investigators in this study of light, who said, "I seem to
have wandered on the shore of Truth's great ocean, and to have
gathered a few pebbles more beautiful than common; but the vast
ocean itself rolls before me undiscovered and unexplored."

[Page 37]
EXPERIMENTS WITH LIGHT.

A light set in a room is seen from every place; hence light streams
in every possible direction. If put in the centre of a hollow sphere,
every point of the surface will be equally illumined. If put in
a sphere of twice the diameter, the same light will fall on all
the larger surface. The surfaces of spheres are as the squares
of their diameters; hence, in the larger sphere the surface is
illumined only one-quarter as much as the smaller. The same is true
of large and small rooms. In Fig. 7 it is apparent that the light
that falls on the first square is spread, at twice the distance,
over the second square, which is four times as large, and at three
times the distance over nine times the surface. The varying amount
of light received by each planet is also shown in fractions above
each world, the amount received by the earth being 1.

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