On Apr 20, 7:48*pm, RichD wrote:
This may be a dumb question, I never studied acoustics....
If you look into the wrong end of a telescope,
everything looks reduced, 'anti-magnified'.
Is there anything analogous acoustically?
In both cases, the phenomena is described
by wave equations -
--
Rich
Acoustic imagery is exactly analogous to light imagery except that
having longitudinal waves there is no polarization affect.
The long wavelength makes diffraction much more dominant that for
light. Materials also have much greater dispersion over audible
frequencies.
Lenses tend to be difficult to demonstrate compared to mirrors due to
the large impedance mismatch to air. However, for a very limited
bandwidth an interested demonstrator could easily be made using layers
of less dense materials to build up an anti reflection coating. This
should not be too difficult due to the long wavelengths involved.
This is a demonstration I've always wanted to make but never had the
time.
http://richardfisher.com/