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    Re: Bris does not work
    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

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