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Chapter 18
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Chapter
Review
Questions
Mrs. Miller
6A
What do you “think”
when you hear
the word
opaque?
???Answer???
NO WAY!
What do “think”
when you hear
the word
translucent?
???Answer???
SOME!
What do “think”
when you hear
the word
transparent?
???Answer???
ALL!
Name three
Kinds of mirrors.
???Answer???
plane
convex
concave
What carries
the signals
generated by the
rods and cones
*TO* your brain?
???Answer???
your
optic nerve
Describe the
light that a laser
produces
in ONE word.
???Answer???
coherent
What is the
reason that a
laser beam can
travel through a
curled-up optical fiber?
???Answer???
because of
total internal reflection
What color would
a red tomato
appear under a
blue light?
???Answer???
The tomato would
appear black!
Name 3 things
that can
occur when
light strikes
an object.
???Answer???
The light can be:
• reflected
• absorbed
• transmitted
Clear glass,
water, and
air are examples
of what kind of
material?
???Answer???
transparent
What happens
when light passes
from air into
water?
???Answer???
The light
Slows down
What happens
when white light
strikes a
black object?
???Answer???
no light is
reflected
What is the
hole through which
light enters
the eye?
???Answer???
The
pupil
What happens
when parallel rays
of light hit a
smooth surface?
???Answer???
regular
reflection
What are the
primary colors of
LIGHT?
???Answer???
Red
Green
Blue
Are frosted glass
and wax paper:
transparent
translucent
or opaque?
???Answer???
translucent
Describe what is
happening if a
person is
nearsighted.
???Answer???
Nearsightedness
•they don’t see well far away
•their eyeballs are a little
too long
What do we call
long, thin strands
of glass or plastic
that carry light for
long distances
without allowing
the light to fade.
???Answer???
Optical fibers
What do we call
the transparent
front surface
of the eye?
???Answer???
cornea
What do we call
an image of a
distant object
caused by
refraction of light?
???Answer???
mirage
What device uses
lenses to focus
light rays and
record an image
of an object on
photographic film?
???Answer???
camera
Where are the
rods and cones
located?
???Answer???
On the retina
What occurs
when parallel
rays of light
hit a rough
or bumpy surface?
???Answer???
diffuse
reflection
What are
substances called
that are used
to color
other materials?
???Answer???
pigments
What instrument
is used in
holography?
???Answer???
A laser
What do any two
primary colors of light
combined in
equal amounts
produce?
???Answer???
A
secondary
color
Name a difference
between the
refracting telescope
and the
reflecting telescope.
???Answer???
Refracting telescope
- uses lenses
Reflecting telescope
- uses mirrors
This is located
where the optic nerve
begins, and it is
part of the retina.
What is it?
???Answer???
the
blind spot
What is an
instrument called that
uses a combination
of lenses to
produce enlarged
images of tiny objects?
???Answer???
A
microscope
What is it called
when the surface
of a mirror curves
inward, like the
inside of a bowl?
???Answer???
concave
mirror
What instruments
uses lenses or mirrors
to collect and
focus light from
distant objects?
???Answer???
telescopes
Because the light
rays never meet,
a concave lens
can produce what
kind of image?
???Answer???
only a
virtual image
What are the
light-sensitive
cells of the eye?
???Answer???
Rods and cones
What kind of
lenses or mirrors
can usually be used
to correct
farsightedness?
???Answer???
convex
lenses
A photographic
slide is an
example of what?
???Answer???
Color
filter
What do we call
the bending of
light rays as
they enter
a new medium?
???Answer???
refraction
What do we call
a curved piece of glass
or other transparent
material that is used
to refract light?
???Answer???
lens
Why are lasers
useful in
surgery?
???Answer???
laser incisions
usually heal
faster than
scalpel cuts
What shape is a lens
that is thinner in
the center than
at the edges?
???Answer???
concave
What do we call
the colored ring of
muscle that controls
the size of the
pupil?
???Answer???
iris
What do we call
the bending of
light rays as they
enter a new
medium?
???Answer???
refraction
What helps the lens
relax or contract
when focusing on
objects nearby
or far away?
???Answer???
Ciliary
muscles
_________________
is formed where
light rays meet
at a point.
???Answer???
A real image
A mirage is caused
by ____________
as light passes through
layers of air
at different
________________.
???Answer???
refraction
temperatures
What is the
colored ring of
muscle around
the pupil?
???Answer???
iris
A ________ lens is
thicker
in the center
than at its edges.
???Answer???
convex
To focus light,
muscles in the eye
change the length and
thickness of the
____________.
???Answer???
lens
Nearby objects
appear blurry
to a person
who is
_____________.
???Answer???
farsightedness
What part of a
your eye helps you
see in dim light?
???Answer???
The rods
What part of a
telescope or
microscope
magnifies the
image?
???Answer???
The eyepiece
What do we call
light waves that are
in step, or have
crests aligned
with crests?
???Answer???
coherent
When the three
primary colors of
PIGMENTS are
mixed, what is the
resulting color?
???Answer???
black
When you focus
on a distant object,
what does the lens
in your eye do?
???Answer???
The lens becomes
longer and thinner
What part of the
eye functions only
in bright light and
responds to color?
???Answer???
The
cones
What do we call
the point at which
light rays
meet?
???Answer???
The
focal point
What is a
hologram?
???Answer???
a
three-dimensional
photograph
How are signals
sent through
optical fibers?
???Answer???
The lasers convert
electrical signals
into pulses of light.
As parallel rays of
light pass through
a(n)_________ lens,
they are bent toward
the center of
the lens.
???Answer???
convex
Because of
refraction, what do
glass prisms separate
white light into?
???Answer???
a visible
spectrum
of colors
What does a
Material’s Index of
Refraction
measure?
???Answer???
It measures how much a
ray of light BENDS when
it enters that material.
________________
occurs when
parallel rays of light
hit a bumpy,
or uneven,
surface.
???Answer???
Diffuse reflection
What science
chapters
will we cover
the last
Nine Weeks?
???Answer???
Chapter 19
Chapter 20
Chapter 13
Chapter 14
??DID YOU KNOW??
It is A LOT of ink
but these slides
CAN be printed
as flashcards!
What is a
color filter?
???Answer???
It is a transparent
material that allows
certain colors of
light to pass
through it and
reflects or absorbs
other colors.
What is the name
of the layer
of cells lining the
inside of the
eyeball?
???Answer???
retina
Why is the white
back and tail
of a skunk
appear white
and the legs
look black?
???Answer???
White – reflects
all colors of light
Black – absorbs
all colors of light
Explain why a pencil
in a glass of water
appears bent
looking at it
from the side!
???Answer???
Because the rays
that pass through
the lens are bent
away from the
center of the lens
and spread out!
What is the
Web address
of your science
text Online?
???Answer???
www.phsuccessnet.com
Are you also
studying from your
comparison *chart*
of
plane-concave-convex
that you made in class?
???Answer???
Yes!
It is VERY HELPFUL!
What do you get if you overlap
all the primary colors of light?
What do you get if you overlap
all the primary colors of pigment?
???Answer???
White
Black
So, how does a
television show
the color black?
???Answer???
The TV switches
off all the colored
lights in the area
of the screen
that appears black!
What colors are
used in the
four-color
printing process?
???Answer???
Cyan
Yellow
Magenta
Black
Another Web site
linked to your
textbook is
www.phschool.com
???Answer???
www.phschool.com
I like their
HOT LINKS
And
INTERNET ACTIVITIES
The
End