Q34.1
Which of the following changes its focal length when it is
immersed in water?
A. a concave mirror
B. a convex mirror
C. a diverging lens
D. more than one of A, B, and C.
E. none of A, B, or C.
© 2016 Pearson Education, Inc.
A34.1
Which of the following changes its focal length when it is
immersed in water?
A. a concave mirror
B. a convex mirror
C. a diverging lens
D. more than one of A, B, and C.
E. none of A, B, or C.
© 2016 Pearson Education, Inc.
Q34.2
A concave mirror with a radius of curvature of 20 cm has a
focal length of
A. 40 cm.
B. 20 cm.
C. 10 cm.
D. 5 cm.
E. unknown, as answer depends on the index of
refraction of the air around the mirror.
© 2016 Pearson Education, Inc.
A34.2
A concave mirror with a radius of curvature of 20 cm has a
focal length of
A. 40 cm.
B. 20 cm.
C. 10 cm.
D. 5 cm.
E. unknown, as answer depends on the index of
refraction of the air around the mirror.
© 2016 Pearson Education, Inc.
Q34.3
An object is placed 4.0 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
A34.3
An object is placed 4.0 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
Q34.4
An object is placed 2.0 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
A34.4
An object is placed 2.0 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
Q34.5
An object is placed 1.5 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
A34.5
An object is placed 1.5 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
Q34.6
An object is placed 0.5 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
A34.6
An object is placed 0.5 m away from a concave mirror of
focal length +1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
Q34.7
An object is placed 2.0 m away from a concave mirror of
focal length –1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
A34.7
An object is placed 2.0 m away from a concave mirror of
focal length –1.0 m. The image formed by the mirror is
A. real and larger than the object.
B. real and smaller than the object.
C. real and the same size as the object.
D. virtual and larger than the object.
E. virtual and smaller than the object.
© 2016 Pearson Education, Inc.
Q34.8
When you look in a cosmetics mirror of focal length f, your
reflection appears right-side up and enlarged. Complete the
sentence: “For a cosmetics mirror to work, the mirror must be
_________ and the distance from the mirror to your face must
be _________.”
© 2016 Pearson Education, Inc.
A34.8
When you look in a cosmetics mirror of focal length f, your
reflection appears right-side up and enlarged. Complete the
sentence: “For a cosmetics mirror to work, the mirror must be
_________ and the distance from the mirror to your face must
be _________.”
© 2016 Pearson Education, Inc.
Q34.9
An object PQ is placed in
front of a converging lens,
forming a real image
If you use black paint to
cover the lower half of the
lens,
A. only the object’s upper half will be visible in the image.
B. only the object’s lower half will be visible in the image.
C. only the object’s left-hand half will be visible in the image.
D. only the object’s right-hand half will be visible in the image.
E. the entire object will be visible in the image.
© 2016 Pearson Education, Inc.
A34.9
An object PQ is placed in
front of a converging lens,
forming a real image
If you use black paint to
cover the lower half of the
lens,
A. only the object’s upper half will be visible in the image.
B. only the object’s lower half will be visible in the image.
C. only the object’s left-hand half will be visible in the image.
D. only the object’s right-hand half will be visible in the image.
E. the entire object will be visible in the image.
© 2016 Pearson Education, Inc.
Q34.10
A thin diverging lens has focal length f = –12 cm. If an object
9 cm tall is placed 24 cm from the lens, what is the height of
the image?
A. 27 cm tall
B. 18 cm tall
C. 9 cm tall
D. 4.5 cm tall
E. 3 cm tall
© 2016 Pearson Education, Inc.
A34.10
A thin diverging lens has focal length f = –12 cm. If an object
9 cm tall is placed 24 cm from the lens, what is the height of
the image?
A. 27 cm tall
B. 18 cm tall
C. 9 cm tall
D. 4.5 cm tall
E. 3 cm tall
© 2016 Pearson Education, Inc.
Q34.11
Which statement is true about a farsighted (hyperopic) eye?
A. The image point is in front of the retina; a converging
eyeglass lens is used to correct this condition.
B. The image point is in front of the retina; a diverging
eyeglass lens is used to correct this condition.
C. The image point is behind the retina; a converging
eyeglass lens is used to correct this condition.
D. The image point is behind the retina; a diverging eyeglass
lens is used to correct this condition.
E. None of the above is true.
© 2016 Pearson Education, Inc.
A34.11
Which statement is true about a farsighted (hyperopic) eye?
A. The image point is in front of the retina; a converging
eyeglass lens is used to correct this condition.
B. The image point is in front of the retina; a diverging
eyeglass lens is used to correct this condition.
C. The image point is behind the retina; a converging
eyeglass lens is used to correct this condition.
D. The image point is behind the retina; a diverging eyeglass
lens is used to correct this condition.
E. None of the above is true.
© 2016 Pearson Education, Inc.
Q34.12
You are choosing lenses for a telescope that you will use to
look at the moon and planets. You should select
A. an objective lens with a long focal length and an eyepiece
lens with an even longer focal length.
B. an objective lens with a long focal length and an eyepiece
lens with a shorter focal length.
C. an objective lens with a short focal length and an eyepiece
lens with a longer focal length.
D. an objective lens with a short focal length and an eyepiece
lens with an even shorter focal length.
E. an objective lens and an eyepiece lens with equal focal
lengths.
© 2016 Pearson Education, Inc.
A34.12
You are choosing lenses for a telescope that you will use to
look at the moon and planets. You should select
A. an objective lens with a long focal length and an eyepiece
lens with an even longer focal length.
B. an objective lens with a long focal length and an eyepiece
lens with a shorter focal length.
C. an objective lens with a short focal length and an eyepiece
lens with a longer focal length.
D. an objective lens with a short focal length and an eyepiece
lens with an even shorter focal length.
E. an objective lens and an eyepiece lens with equal focal
lengths.
© 2016 Pearson Education, Inc.
Q34.13
You are designing a telescope that will use a single lens. The
purpose of the telescope is to take photographs of the moon. The
lateral magnification m of the image will be in the range
A. m > 1.
B. 0 < m < 1.
C. –1 < m < 0.
D. m < –1.
E. Not enough information is given to decide.
© 2016 Pearson Education, Inc.
A34.13
You are designing a telescope that will use a single lens. The
purpose of the telescope is to take photographs of the moon. The
lateral magnification m of the image will be in the range
A. m > 1.
B. 0 < m < 1.
C. –1 < m < 0.
D. m < –1.
E. Not enough information is given to decide.
© 2016 Pearson Education, Inc.
Q-RT34.1
Five identical objects, each of height 1.0 cm, are each placed on
one side of one of five thin lenses. The five lenses have different
focal lengths f, and the distance from the object to the lens is
different in each case. Rank the five combinations of object and
lens in order of the lateral magnification of the image, from
most positive to most negative.
A. Object 2.0 cm from converging lens with f = +4.0 cm.
B. Object 6.0 cm from converging lens with f = +4.0 cm.
C. Object 4.0 cm from converging lens with f = +2.0 cm.
D. Object 2.0 cm from diverging lens with f = –2.0 cm.
E. Object 4.0 cm from diverging lens with f = –2.0 cm.
© 2016 Pearson Education, Inc.
A-RT34.1
Five identical objects, each of height 1.0 cm, are each placed on
one side of one of five thin lenses. The five lenses have different
focal lengths f, and the distance from the object to the lens is
different in each case. Rank the five combinations of object and
lens in order of the lateral magnification of the image, from
most positive to most negative.
A. Object 2.0 cm from converging lens with f = +4.0 cm.
B. Object 6.0 cm from converging lens with f = +4.0 cm.
C. Object 4.0 cm from converging lens with f = +2.0 cm.
D. Object 2.0 cm from diverging lens with f = –2.0 cm.
E. Object 4.0 cm from diverging lens with f = –2.0 cm.
© 2016 Pearson Education, Inc.
Answer: ADECB