P3D Re Holograms

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

I was interested in Ken Dunkley's to Bob Maxey's post that not all
holograms reproduce the whole view from a broken fragment. We have a white
light reflection hologram at work of a piece of netsuke (Japanese ivory
carving). Which got broken by accident and each piece shows only part of
the carving ,like Ken says it is an image plane hologram with part of the
image apearing in front of the plate. Although I suspect that a hologram
apearing as a virtual image just behind the plate may not show the whole
view if broken either. It may have to be some distance behind the plate for
the whole object to be seen through part of it as would be the case with a
real object.  Another slightly nit -picking point Bob-Maxey used the term
holograph , in the UK at least that term has to be avoided in favour of
hologram as the term holograph is already used to describe an authors
original draught in their own handwriting.        P.J.Homer



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