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210
The Fairy-Land of Science
·
Arabella B. Buckley
39
But
the
reflected
light-waves
do
more
for
us
than
this.
They
not
only
make
us
see
things,
but
they
make
us
see
them
in
different
colours.
What,
you
will
ask,
is
this
too
the
work
of
the
sunbeams?
Certainly;
for
if
the
colour
we
see
depends
on
the
size
of
the
waves
which
come
back
to
us,
then
we
must
see
things
coloured
differently
according
to
the
waves
they
send
back.
For
instance,
imagine
a
sunbeam
playing
on
a
leaf:
part
of
its
waves
bound
straight
back
from
it
to
our
eye
and
make
us
see
the
surface
of
the
leaf,
but
the
rest
go
right
into
the
leaf
itself,
and
there
some
of
them
are
used
up
and
kept
prisoners.
The
red,
orange,
yellow,
blue,
and
violet
waves
are
all
useful
to
the
leaf,
and
it
does
not
let
them
go
again.
But
it
cannot
absorb
the
green
waves,
and
so
it
throws
them
back,
and
they
travel
to
your
eye
and
make
you
see
a
green
colour.
So
when
you
say
a
leaf
is
green,
you
mean
that
the
leaf
does
not
want
the
green
waves
of
the
sunbeam,
but
sends
them
back
to
you.
In
the
same
way
the
scarlet
geranium
rejects
the
red
waves;
this
table
sends
back
brown
waves;
a
white
tablecloth
sends
back
nearly
the
whole
of
the
waves,
and
a
black
coat
scarcely
any.
This
is
why,
when
there
is
very
little
light
in
the
room,
you
can
see
a
white
tablecloth
while
you
would
not
be
able
to
distinguish
a
black
object,
because
the
few
faint
rays
that
are
there,
are
all
sent
back
to
you
from
a
white
surface.
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