Severi Salminen wrote:
> Thanks for the clarification. The important part is the actual net
> effect that affects the image. If the 4% (or whatever n1 and n2 gives)
> holds true in most cases and is accurate within some margin - that is
> suitable for now.

I think it's more like 4% is going to be the average surface 
reflectivity, and you really have to manufacture the glass smooth and 
with a constant thickness within a fraction of a wavelength to see any 
difference.

The "not always 4%" effect can be seen in things like oil floating on 
water, where the layer of oil is less than a few wavelengths thick, so 
you see the different colors reflecting with different percentages.

For a "normal" block of glass, yah, it's going to be about 4%, because 
you're going to average a whole bunch of thicknesses of glass and a 
number of different angles (as your pupil has a size much larger than a 
wavelength of light too).

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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