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Science 8
Optics Unit
Question Completion
Asking for Help
Working in Class
G
I have completed all of the assigned
questions, completed all diagrams, and
corrected all wrong answers.
I asked questions during the lesson, I was focussed in class, participated in the lesson
or asked for extra help (in or
and worked hard on my classwork practice.
outside of class) when I needed it.
S
I completed most of the assigned questions, I asked questions or asked for extra I was only somewhat focussed in class,
but did not finish all diagrams required, did help (in or outside of class) when I participated in the lesson and worked on my
not correct wrong answers, or have it done need it.
classwork practice.
on time.
N
I have not completed the assigned questions I didn’t ask questions in class or ask I was not focussed in class, didn’t participate in
or finished the required diagrams. I never
for extra help when I needed it.
the lesson or work very hard on my classwork
got my work done on time.
practice in class.
Chapter 11 – Mirrors and Lenses
Pages 312 - 339
Name: _____________________
Date: ____________
Block: ________
Section 11.1 – Reflecting Light Off a Plane Mirror (page 313)
1. Define plane mirror:
2. Draw a light ray diagram for a ray that is reflected by a plane (flat) mirror. Label
each of the following parts of the diagram:
 Incident ray
 Reflected ray
 Angle of incidence
 Angle of reflection
 The normal
 Point of Incidence
3. All mirrors
light.
4. In a plane mirror, what is the size, attitude, and location of the image in relation
to the object?
Size
Attitude
Location
Section 11.2 – Reflecting Light Off Surfaces (pages 316 – 318)
1. Define specular reflection:
2. State the two laws of reflection.
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3. Define diffuse reflection:
4. What is the largest possible angle of incidence for a light ray traveling toward a
mirror? What is the smallest possible angle of incidence?
5. If the only source of light in a room is one light bulb, why can we see everything in
the room?
6. Give examples of how an interior designer might benefit from knowledge of diffuse
reflection. Choose an example of direct light and an example of indirect light in
your home. Briefly summarize their effectiveness.
Section 11.3 – Describing Images (pages 319 – 320)
1. Describe image:
2. Describe real image:
3. Describe virtual image:
4. What is an optical device? Give some examples.
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5. List the Characteristics of Images (refer to Table 1 on page 320).
Characteristic
Size
Possible Descriptions
Attitude
Location
Type
6.
What does upright mean?
What does inverted mean?
Section 11.6 – Using Curved Mirrors (pages 326 – 328)
1. A
is a mirror that curves inwards. The image formed by this
mirror depends on how far away the object is from the
.
2. How can you describe light rays that come together at a focal point?
3. If an object is far from a concave mirror, the image is small and
This image is considered to be what type of image, virtual or real?
.
4. If an object is close to a concave mirror, then the image appears to be larger than
the object and is
. This image is considered to be what type of
image, virtual or real?
5. Give some examples of uses for concave mirrors.
6. There are other kinds of radiation energy that we can’t see that exist. Explain the
shape of satellite dishes that receive radio signals from satellites in orbit around the
Earth.
3
7. What type of image would you expect to see if you looked at yourself in the bowl of
a spoon?
8. A
is a mirror that curves outwards. It reflects parallel light rays
as if they came from the focal point
the mirror.
9. The image of an object in a convex mirror will always be
and
from the mirror than the object. This image is considered to
be what type of image, virtual or real?
10. When light rays spread apart after being reflected, they are considered to be what?
11. What are some examples in life that use convex mirrors?
12. Why are large convex mirrors used for security in stores? (Hint – what happens to
the light reflecting off of a shoplifter if the storekeeper can see the thief?)
13. Briefly describe how the principal focus in a concave mirror is the same and how it
is different from the principal focus in a convex mirror.
14. For each situation, state whether the image produced is real or virtual. Explain how
you know.
Real or Virtual
Explanation
a) A girl standing close to a
cosmetic mirror applying
lipstick.
b) An astronomer is looking
at an image of the Moon
through her telescope, which
has a concave mirror.
c) A clerk in a drugstore is
looking at the image of a
customer in a surveillance
mirror.
15. Which of the following mirrors can produce an upright image: plane mirror, convex
mirror, concave mirror?
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Section 11.7 – The Refraction of Light (pages 329)
1. Define refraction:
2. Define angle of refraction:
3. Define refracted ray:
Section 11.8 – Refracting Light in Lenses (pages 331 - 333)
1. Define lens:
2. Explain why light bends as it travels from air into water.
3. Describe what a convex lens looks like.
4. Describe what a concave lens looks like.
5. Does a light ray that passes through the middle of either or convex or concave lens
refract light? Why or why not?
6. What happens to the light rays that pass through a convex lens?
7. What happens to the light rays that pass through a concave lens?
8. What is another word or words for normal in relation to light rays?
9. A concave lens refracts light rays towards or away from the normal?
10. A convex lens refracts light rays towards or away from the normal?
11. Make a list of devices that use a least one lens.
5
Review of Concepts
Mirrors
Concave
Convex
Draw a picture of each mirror
Do light rays converge or diverge?
Image upright or inverted?
Image smaller or larger than object?
Image real or virtual?
Lenses
Concave
Draw a picture of each mirror
Do light rays converge or diverge?
Image upright or inverted?
Image smaller or larger than object?
Image real or virtual?
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Convex