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Huygens' principle
name
(physics)
The
assumption
that
each
point
on
a
wavefront
may
be
regarded
as
a
source
of
secondary
waves
and
that
the
position
of
the
wavefront
at
a
later
time
is
determined
by
the
envelope
of
these
secondary
waves;
proposed
in
order
to
explain
the
fact
that
light
travels
in
a
straight
line
and
casts
sharp
shadows.
Huygens-Fresnel principle
name