Apparatus:
microwave
transmitter
&
receiver,
styrene
pellets,
polystyrene
hollow
prisms
(right-angled
triangle,
2),
goniometer.
Description:
with
proper
alignment,
the
first
of
the
2
prisms
filled
with
styrene
pellets
will
block
all
of
the
transmitted
microwaves
from
the
receiver.
Upon
placing
the
second
prism
in
the
path
at
an
optimal
distance
from
the
first,
microwaves
are
once
more
detected.
PIRA 7A50.20