Re: [OM] Rainbows & polarizers, was: Desks, film and jpgs

[Mark Marr-Lyon]

The internal reflection inside the raindrop happens near Brewster's angle,
which makes the reflected light polarized.  The polarization angle changes
around the rainbow, so the polarizer won't make all of the rainbow disappear
at once.
See
http://www.polarization.com/rainbow/rainbow.html
http://en.wikipedia.org/wiki/Brewster's_angle

Mark

On Sat, May 30, 2009 at 7:14 AM, Chuck Norcutt <
chucknorcutt@xxxxxxxxxxxxxxxx> wrote:

> Can somebody explain this rainbow effect?  AFAIK, rainbows are seen at
> 180 degrees from the sun.  Polarization is at maximum 90 degrees from
> the sun and at minimum 180 degrees from the sun.  It would seem to me
> that a polarizer should have little or no effect on a rainbow.  Have I
> got it wrong?  How?
>
> Chuck Norcutt
>
> Wayne Harridge wrote:
> > I didn't know a polariser removed rainbows.  It will probably enhance the
> > rainbow if you rotate it 90 degrees.
> >
> > ...Wayne
> >
> > Wayne Harridge
> > http://lrh.structuregraphs.com/
> >
> >
> >> -----Original Message-----
> >> From: Mike Lazzari []
> >> Sent: Saturday, 30 May 2009 1:51 AM
> >> To: 1
> >> Subject: Re: [OM] Desks, film and jpgs
> >>
> >> A white balance disk would be useful for mixed lighting indoors and of
> >> course removing that annoying color cast of sunrise and sunset. Add it
> >> to your bag with the polarizer which is useful for removing rainbows :-
> >> )
> >>
> >> Mike
> >> --
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