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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Bris does not work
From: Bill B
Date: 2012 Jul 27, 17:27 -0400
From: Bill B
Date: 2012 Jul 27, 17:27 -0400
On 7/27/2012 5:18 PM, eremenko@math.purdue.edu wrote: > > Greg, > Now I understand the role of the second (inner) reflection > But your diagram is not quite correct: > When the ray passes from the air to the glass it is refracted. > It is also refracted when it comes back from the glass to the air. > And the outcoming ray is indeed not parallel to the ray reflected > from the front surface. > And this is because of these two additional refractions. Greg and Alex The make up of the filter (darker glass) can also make a difference in the number of images, depending on whether it is tinted all the way through or surface coated. A polarizing filter, if darker film sandwiched between two pieces of clear glass, might also add a wrinkle to the equation. Bill B