താൾ:CiXIV132a.pdf/384

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LXXXII

exposed to the light of the sun. If our organ of sight would be
sharper perhaps we might see this continuation of shining in
more Stones.

B. Optics in a special sense.

§ 177. The propagation of light takes place in mediums,
which allow the light to traverse, in a right line, which line is
called a ray light (luminous ray). 356.

§ 178. The velocity of light was determined by Roemer
by an observation of the eclipses of Jupiter's first satellite. 358.

§ 179. Effects of light in general are:
1). It makes bodies visible (light itself we cannot see, we
see only the bodies, from which it proceeds).
2) It furthers the growth of organic bodies (the colour of
plants and of men). See § 223.
3) Chemical decompositions (pure concentrated nitric acid
is coloured by light; it separates gold from its solutions, silver
from argentates; destroys most colours. See §§ 201. 220-222.

§ 180. Effects of light on different bodies. Some bodies
stop the rays of light and are called opaque bodies, others trans
mit light and are called transparent (or translucent) bodies.
All bodies absorb part of the light, polished surfaces reflect it.
357. 360. 361. There are no perfect opaque (not transparent)
or transparent bodies. Why are snow and powdered ice not
transparent?

§ 181. The intensity of light is inversely as the square
of its distance. 359. "The light of the sun is about equal to
that which would be given by 50,000 wax candles at a distance
of one yard; that of the full-moon is equal to that given by one
wax candle at a distance of 126 inches."

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