Re: [Phys-L] Refraction Implications

[Anthony Lapinski <alapinski@pds.org>]

Neat video! I do a similar demo every year. I use a large playing card
taped to the back of a half filled (2.5 gal) aquarium. The card through the
water appears closer, and also why (full) swimming pools appear
shallower than they really are. Does the travel time have to do with the
speed of light being slower in water compared to air?

On Thu, May 6, 2021 at 12:36 PM Paul Nord <Paul.Nord@valpo.edu> wrote:

> Did I mistype that link?
>
> https://www.youtube.com/watch?v=JsoOlPpDv9I
>
> Paul
>
> On Thu, May 6, 2021 at 11:31 AM Anthony Lapinski <alapinski@pds.org>
> wrote:
>
> > Says video unavailable...
> >
> > On Thu, May 6, 2021 at 12:27 PM Paul Nord <Paul.Nord@valpo.edu> wrote:
> >
> > > Two measurements of refraction give apparently contradictory results.
> > >
> > > A parallax measurement from air into a denser refractive material shows
> > > that distance to the back of the material appears to be shorter than
> the
> > > actual length.
> > > A time of flight measurement of a laser pulse indicates that the
> distance
> > > to be back appears to be longer.
> > >
> > > I made a video to demonstrate this:
> > > https://youtu.be/JsoOlPpDv9l
> > >
> > > Before you send me refraction diagrams, yes I understand that all of
> > these
> > > observations are correct.  Light slows down in proportion to the index
> of
> > > refraction.  Light bends according to Snell's Law.  I understand those
> > > principles.  Frankly, I'm enjoying the contradiction between the two
> > > measurements above.  Oftentimes at a point of contradiction like this
> > there
> > > is a deeper understanding to be gleaned.  Help me out there.  To what
> new
> > > insights might this lead?
> > >
> > > Paul
> > > _______________________________________________
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