Dan P nous apporta ses lumieres ainsi en ce 2004/04/25 13:04... :

> Jellby wrote:
>
>> Among other things, Dan P wrote:
>>
>>> Truth: A body cannot reflect less light than is applied to it.
>>
>>
>> Huh?
>
>
> Yep; strange to think that way, I know, but that is a truth!
> (Please don't bring up black holes either -- we aren't modelling those)

Receive visible light, absorbs it and transform it to heat, re-emit it 
as thermal infrared light. Energy in = energy out.

Alain

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