Physics Principles and Problems 2009

Section 18.2 : Convex and Concave Lenses

Self-Check Quizzes

1
For lenses, what does a negative magnification mean?
A)The image can only be seen if viewed parallel to the focal axis.
B)The image cannot be seen by the human eye.
C)The image is smaller than the object.
D)The image is inverted compared to the object.
2
An object placed at 2F from a convex lens will _____.
A)produce an image that is smaller than the object
B)produce an image that is the same size as the object
C)produce an image that is larger than the object
D)produce an image that is a virtual
3
A photo is held 25 cm from a convex lens with a focal length of 30 cm. What is the image position of the photo?
A)–150 cm
B)150 cm
C)5 cm
D)–5 cm
4
di for an image from a concave lens is always _____.
A)The opposite of the focal length
B)positive
C)a whole number fraction of do
D)negative
5
Why do combinations of lenses produce sharper images?
A)The more times the image is focused, the sharper it becomes.
B)They can correct for spherical and chromatic aberration.
C)The focal length becomes shorter with each additional lens used.
D)The image shifts alternately between virtual and real.
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