Optics: Technical, not piano - perhaps clutter

[Paul]

List

Delete my previous post. I replied to a partial post of Jim's. The following
is the real explanation.

Paul Chick
----- Original Message -----
From: <JIMRPT@AOL.COM>
To: <pianotech@ptg.org>
Sent: Thursday, July 13, 2000 12:06 AM
Subject: Re: Optics: Technical, not piano - perhaps clutter


>
> In a message dated 7/13/2000 12:06:34 AM, Ron wrote:
>
> <<It's
>
> apparently a refraction thing, since the viewing angle was so narrow and
>
> definite. This really intrigues me, since it isn't obvious to me how it
>
> works, and is, indeed, downright wrong by what I think I know but is, at
>
> the same time, obviously real.>>
>
> Yep you are correct oh Sage, it is refraction. The same thing happens when
> you look down at the planes shadow on the ground and see a rainbow effect
> around the front edges of the shadow...this is also refraction effect from
> the compressed/bent air/water molecules on the leading edges.......on a
big
> prop type plane, such as a
> C-130, the effect is most pronounced around the propellers themselves.
This
> is most apparent when the sun is in the opposite position, relative to the
> plane that you describe..............your refraction though is coming from
> the moisture in the air (evaporating water) above those bodies of water
and
> the operative angles are the suns position, the height above the body of
water
>  of the aircraft, and the position of the body of water elative to the
> aircraft.  It is a prismatic effect and can be quite beautiful for as long
as
> it lasts.
>
> <<" since the viewing angle was so narrow and
>
> definite. This really intrigues me, since it isn't obvious to me how it
>
> works">>
>
> Ron diagram this thingee out and you will find that the angles create a
> defacto prism but since you are in effect part of the prism in the
aircraft,
> in effect being the Y tangent, the only thing you will see is a distinct
> brightening of the light.
> Jim Bryant (FL)
>