George wrote:
>
> You do raise an intersting point, Wayne. IE: How do we
> *know* the reflectance of the film is the same during the
> time it is briefly exposed as it is after it's been in the
> light long enuf to take a spot reading from it? I mean, it's
> really a case of possibly being unable to do the experiment
> without altering the variables.
>
Heisenberg strikes again !
Wayne Harridge
Ivanhoe, Victoria, Australia
http://www.geocities.com/Paris/Louvre/6152/
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