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Mirrors and lenses
Science, Grade 6
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Study Guide Mirrors and lenses Science, Grade 6
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MIRRORS
AND
LENSES
Overview
The
reflection
of
light
can
occur
in
different
ways.
Since
a
mirror
has
a
very
smooth
surface,
all
the
light
bouncing
off
of
a
mirror
reflects
in
a
regular
manner.
In
a
plane
or
flat
smooth
mirror,
the
image
that
forms
is
virtual
which
means
it
doesn’t
really
exist.
In
the
picture
below,
while
the
image
is
the
same
size
as
the
object
and
is
upright
like
the
object,
its
left
and
right
sides
are
reversed
and
it
seems
to
be
behind
the
mirror.
LESSON
CHECKPOINT:
How
does
light
reflect
off
of
a
plane
mirror
and
what
kind
of
image
forms
as
a
result?
When
light
hits
a
concave
or
bowl-like
mirror,
the
image
that
forms
can
be
either
virtual
or
real.
A
real
image
is
one
that
looks
upside
down
and
can
be
smaller
or
larger
than
the
object.
Whether
the
image
is
virtual
or
real
depends
on
how
far
the
object
is
from
the
concave
mirror.
LESSON
CHECKPOINT:
What
kinds
of
images
form
off
of
a
concave
mirror?
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purchaser
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Light
Refraction
Refraction
or
the
bending
of
light
occurs
when
light
enters
at
an
angle
through
a
different
medium
The
refraction
of
light
through
a
lens
can
have
much
different
results
depending
on
whether
the
lens
is
convex
or
concave.
A
convex
lens
is
thicker
in
the
center
than
it
is
at
the
ends
and
a
concave
lens
is
just
the
opposite.
In
the
diagram
below,
notice
how
the
light
coming
through
the
convex
lens
creates
a
focal
point
or
point
of
convergence
for
the
light.
With
the
concave
lens,
the
light
rays
get
spread
out
and
never
form
a
focal
point.
The
result
of
this
is
that
convex
lenses
can
form
either
real
or
virtual
images
depending
on
how
far
the
object
is
from
the
lens.
On
the
other
hand,
since
light
rays
passing
through
a
concave
lens
never
meet,
the
image
formed
is
always
virtual.
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purchaser
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Human
Vision
Without
our
eyes
and
brain,
vision
would
not
be
possible.
The
eye,
shown
below,
takes
in
light
through
the
small
opening
in
the
eye
called
the
pupil.
The
light
then
goes
through
a
convex
lens
(C)
where
it
is
focused
exactly
on
the
retina
(A).
Here,
many
sensitive
nerve
endings
take
the
focused
light
image
and
convert
it
to
a
nerve
message
(B)
which
goes
to
the
vision
center
in
the
brain.
The
brain
interprets
this
nerve
impulse
as
a
vision.
LESSON
CHECKPOINT:
What
type
of
lens
do
we
have
in
each
eye?
Practical
Applications
The
reflection
and
refraction
of
light
with
mirrors
and
lenses
has
many
practical
applications.
•
Telescopes
use
a
combination
of
mirrors
and
lenses
to
see
distant
objects
•
Microscopes
use
a
combination
of
two
lenses
to
magnify
a
small,
close
object.
•
Cameras
use
lenses
to
focus
images
to
record
on
film
or
in
digital
format.
•
Without
lenses
or
mirrors,
lasers
use
coherent
light
of
only
one
wavelength
to
create
precise
beams
that
can
be
used
to
measure,
to
cut
material,
or
even
as
a
surgical
tool.
•
Optical
fibers
are
thin
strands
of
glass
that
carry
confined
laser
beams.
Because
these
fibers
can
carry
the
laser
over
very
long
distances
they
are
extremely
useful
in
communications
technologies.
Many
homes
have
fiber
optic
service
that
brings
in
internet
websites
and
television
pictures.
These
fibers
are
also
used
to
look
inside
our
bodies.
These
fibers
are
so
thin,
doctors
do
not
have
to
make
large
incisions
in
order
to
see
inside
the
human
body.
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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