Physical Science: Waves, Sound, and Light, Book O

Section 4: Using Mirrors and Lenses

Self-Check Quiz-Eng.

1.
What type of lenses do microscopes use?
A)concave
B)plane
C)convex
D)reflecting
2.
What is the main purpose of a telescope?
A)to gather as much light as possible
B)to magnify an image
C)to make objects appear closer
D)to reflect light at an object
3.
Large telescopes magnify with what?
A)lenses
B)computers
C)mirrors
D)cameras
4.
What is special about zoom lenses?
A)They have a short focal length.
B)They have a long focal length.
C)They allow you to change the focal length.
D)They have no focal length.
5.
What happens to an image when the focal length of a lens is reduced?
A)It gets larger.
B)It remains the same.
C)It gets smaller.
D)It goes out of focus.
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