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what light?From: Steven
Subject: Philosophy
Date/Time 2009-06-16 09:42:27
Remote IP: 74.162.17.113
MessageS,
>>>I was refering to the light traveling within the
>>>plant in this article(see quote below).
OK, thanks.
>>>BTW most things don't give off visible light they reflect it,
>>>unless they are luminesant. Thats why they can't be seen in the dark.
FALSE. Plants are not mirrors.
All objects absorb light and then reemit it.
How much and to what quantity the object emits light
depends upon a number of factors: how much external
light is striking it, what color the object is, what
temperature the object is, whether there is an internal
energy source generating an excess of electromagnetic
radiation in the visible spectrum, etc.
This "reflection" concept is a false notion that people
in pop culture say to each other. The only difference
between a luminuous object and one that is not, is the
relative intensity of what is being emitted. If the
amount of light emitted is significantly more than
the surrounding ambient light, then we say the object
is luminescent.
Even when it gets dark, oftentimes your eyes will adjust
and you will be able to start to see subtle differences
in the emissions, and thus can see "in the dark".
Amplifying/modifying these differences are some of the
principles behind certain types of night goggles, heat
scopes, and the like.
S
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