Grade 8 Science - Ch. 5 Review
True/False
1.
A normal is a line that is parallel to the reflecting surface.
2.
The angle between the incident ray and the normal is called the angle of incidence.
o
o
3.
If the angle of reflection is 55 , then the angle of incidence will also be 55 .
4.
While looking in the bathroom mirror, you observe that your reflection appears to be the same distance behind the
mirror as you are in front of the mirror. This must be a convex mirror.
5.
In a convex mirror, objects appear smaller than they are in reality.
6.
Concave mirrors make great security devices in stores.
7.
Diffuse reflection occurs when light reflects off a rough surface and no image results.
8.
The orientation of an image describes whether the image is upright or upside down in relation to the object.
9.
A virtual image is one that is found where the reflected rays actually meet.
10.
An image seen in a plane mirror will always be the same size as the object.
11.
The characteristics of an image formed in a convex mirror will be smaller and upright.
12.
A makeup mirror is an example of a concave mirror.
13.
In order for an image to form as seen in a mirror, the light rays must reflect from the object first.
Fill-in the blanks
14.
SPOT stands for these image characteristics: S_____________ P_____________ O_____________ T______________
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15.
If the angle of incidence for a light ray is 25 , the angle of reflection will be_______________.
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16.
If the angle between an incident ray and a reflected ray is 110 , the angle of incidence is _____________
17.
The angle between the incident ray and the normal is called the ____________________.
18.
The line perpendicular to the reflecting surface is called the ____________________.
19.
Identify what each letter in the diagram represent
20. In a plane mirror, the angle of incidence is equal to the ____________________ .
21. A ________________________ mirror reflects light rays so they diverge, or spread apart.
Match the letter a or b to the correct number.
a. concave mirror
b. convex mirror
22. when held far away from its surface, objects appear smaller and upside down
23. when light rays reflect off its surface, they diverge
24. used as safety mirrors
25. used in cars as rearview mirrors
26. when held less than one focal length from its surface, objects appear larger and upright
27. when held at any distance from its surface, objects appear smaller and upright
28.
29.
30.
31.
32.
a. diffuse reflection
Light is shone on a plane mirror.
Light is shone on a ceiling with a rough surface.
Light is shone on a smooth piece of aluminum foil.
Light is shone on a crumpled piece of aluminum foil.
Light is shone on a calm lake at night.
b.
specular reflection
Short Answers ( Chapters 4 &5)
1. Draw the image using a ray diagram and describe the image’s characteristics (size, position, orientation, type).
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Explain the experiments by Pythagorus, Galileo and Michelson and summarize what they discovered about light.
What is light?
Explain how scientific knowledge of light resulted in the development of the microscope and telescope.
How does the speed of light compare to the speed of sound?
Identify the 6 properties of visible light.
Describe the different uses of specular and diffuse reflection.
Use a diagram to explain how a prism breaks white light into its constituent colors.
How does the amount of refraction of each color in the spectrum relate to its wavelength?
Draw a labeled diagram of a wave.
Describe the relationship between frequency and wavelength.
Complete simple calculations involving frequency.
Describe the different types of electromagnetic radiation and give examples of each.
Discuss both the negative and positive effects of electromagnetic radiation.
Identify the 3 types of mirrors and explain how they are used.
State the Law of Reflection.
Use 3 incident rays to draw ray diagrams of images in both plane and curved mirrors.
Use S.P.O.T to describe the images formed by plane and curved mirrors
Describe the difference between real images and virtual images and identify the mirrors that will produce them.
Explain how the curvature of a concave mirror influence the size of the real image produced.
Grade 8 Science – Ch. 5 Review
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Size
Position
Orientation
25o
55o
Angle of incidence
Normal or principle axis
a) incident ray b) angle of incidence
angle of reflection
convex
a
b
b
a
a
b
b
a
b
a
b
ANSWER KEY
Type
c) normal
d) angle of reflection
Short answers:
1. See handouts for instructions or textbook pages 198-202
2-20. See notes and textbook.
e) reflected ray