North Carolina Science Grade 6

Chapter 20: Light, Mirrors, and Lenses

Light, Mirrors, and Lenses

1.
Which is not a primary color?
A)yellow
B)green
C)red
D)blue
2.
What type of lenses do microscopes use?
A)concave
B)convex
C)reflecting
D)plane
3.
A mirror with a flat surface is called a __________ mirror.
A)convex
B)concave
C)flat
D)plane
4.
The speed of light is __________.
A)slower in water than in air
B)faster in water than in air
C)the same speed in water and air
D)fastest in water
5.
A source of light emits light rays __________.
A)in a circle
B)only at right angles
C)in all directions
D)in a straight line
6.
Objects that allow only some light to pass through them are considered __________.
A)translucent
B)opaque
C)solid
D)transparent
7.
What is the main purpose of a telescope?
A)to magnify an image
B)to make objects appear closer
C)to gather as much light as possible
D)to reflect light at an object
8.
Which of the following is the law of reflection?
A)The angle of incidence is equal to the angle of reflection.
B)The angle of incidence is equal to the normal.
C)The normal is perpendicular to the reflecting surface.
D)The angle of reflection is equal to the normal.
9.
What causes light waves to refract?
A)The speed of light is reduced to zero.
B)The speed of light remains constant.
C)The speed of light changes from one medium to the next.
D)The light is repelled by some materials.
10.
A wave transfers __________.
A)energy
B)liquid
C)gas
D)matter
11.
What are the primary pigment colors?
A)yellow, magenta, and cyan
B)red, blue, and yellow
C)red, orange, yellow, green, blue, indigo, and violet
D)black and white
12.
The image formed by a concave lens is similar to that formed by a __________.
A)convex mirror
B)convex lens
C)concave mirror
D)plane mirror
13.
Object A reflects more than object B. Therefore, object A is __________ object B.
A)made of the same material as
B)smoother than
C)rougher than
D)just as smooth as
14.
What occurs to light waves in a convex mirror?
A)They converge.
B)They reflect at right angles.
C)They are absorbed.
D)They diverge.
15.
Large telescopes magnify with what?
A)computers
B)mirrors
C)lenses
D)cameras
16.
Which is an example of a convex lens?
A)nearsighted eyeglasses
B)a side mirror on a car
C)a car windshield
D)magnifying glass
17.
Where does an image form on the eye?
A)the retina
B)the cornea
C)the optic nerve
D)the lens
18.
What is a focal length?
A)the distance from the mirror to the reflecting object
B)the distance from the center of the mirror to the focal point
C)the distance light travels along a reflective surface
D)the difference between the angle of incidence and the angle of reflection
19.
Why can you see most objects?
A)they emit light
B)light refracts through them
C)they absorb light
D)light reflects off them
20.
What is called the normal to the surface?
A)the reflecting surface itself
B)the line perpendicular to where the light ray strikes the surface
C)the line parallel to a reflecting surface
D)the angle of the incoming beam of light
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