ame: ________________________ Class: ___________________ Date: __________
Exam 3--PHYS 102--S13
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
____
____
1. A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 25º with the normal. Find the angle of the
ray reflected off the glass surface with respect to the normal.
a. 39º
b. 46º
c. 56º
d. 25º
2. A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 25º with the normal. Find the angle of the
refracted ray within the glass with respect to the normal.
a. 16º
b. 25º
c. 46º
d. 56º
3. A light ray in air is incident on an air-to-glass boundary at an angle of 30.0º and is refracted in the glass at an
angle of 21.0º with the normal. Find the index of refraction of the glass.
a.
b.
c.
d.
1.74
1.40
1.23
2.13
1
ame: ________________________
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____
____
4. If the speed of light through an unknown liquid is measured at 1.80 × 108 m/s, what is the index of refraction
of this liquid? (c = 3.00 × 108 m/s)
a. 1.67
b. 1.20
c. 0.600
d. 1.80
5. A fiber optic cable (n = 1.50) is submerged in water (n = 1.33). What is the critical angle for light to stay
inside the cable?
a. 27.6º
b. 83.1º
c. 41.8º
d. 62.5º
6. The dispersion of light by a prism is made possible by which of these phenomena:
a.
b.
the slowing of light in a medium
the total internal reflection of light
c.
d.
2
the reflection of light in a medium
the wavelength dependence of the index
of refraction
ame: ________________________
____
7. The following figure shows a fiber optic cable. In order for total internal reflection to occur, which of these
statements about the indices of refraction must be true?
a.
b.
n1>n2
n1=n2
c.
d.
n1<n2
Total internal reflection will occur for all
of these scenarios.
____
8. Consider this arrangement of mirrors. What is θR?
____
a. 70°
d. 20°
b. 90°
e. 60°
c. 40°
9. Organize these types of radiation in order of lowest energy to highest energy:
Gamma
Infrared
Microwaves
Visible
a.
b.
infrared, visible, microwave, gamma
microwave, infrared, visible, gamma
c.
d.
3
gamma, infrared, visible, microwave
visible, infrared, microwave, gamma
ame: ________________________
____ 10. Which of these statements best characterize the indices of refraction for this diagram?
a.
b.
n1<n2
n1=n2
c.
d.
n1>n2
All of these can be correct depending on
the wavelength of light
____ 11. An image is found to have a negative image distance. What best describes this image?
a. virtual
c. smaller than the object
b. inverted
d. imaginary
____ 12. Mirages are caused by which of these phenomena?
a. diffraction
c. reflection
b. refraction
d. interference
____ 13. The following figure shows a configuration of an object, lens, and image. What kind of lens has produced
this image?
a.
b.
no lens can create this image
flat
c.
d.
4
convex
concave
ame: ________________________
____ 14. Consider this system of lenses. Where is the final image located?
a. 15 cm to the left of lens 2
c. 60 cm to the right of lens 2
b. 15 cm to the right of lens 2
d. 30 cm to the right of lens 2
____ 15. You stand two feet away from a plane mirror. How far is it from you to your image?
a.
b.
c.
d.
4.0 ft
3.0 ft
5.0 ft
2.0 ft
5
ame: ________________________
____ 16. If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm,
what is the object distance from the mirror?
a. 30 cm
b. 6.0 cm
c. 10 cm
d. 12 cm
____ 17. Which of the following best describes the image of a concave mirror when the object's distance from the
mirror is less than the focal point distance?
a. virtual, upright and magnification less than one
b. virtual, upright and magnification greater than one
c. real, inverted and magnification greater than one
d. real, inverted and magnification less than one
____ 18. When the reflection of an object is seen in a convex mirror the image:
a. will always be enlarged.
b. may be either real or virtual.
c. will always be virtual.
d. will always be real.
____ 19. If atmospheric refraction did not occur, how would the apparent time of sunset be changed?
a. Sunset would occur later.
b. Sunset would occur earlier.
c. Sunset would occur at the same time.
6
ame: ________________________
____ 20. Sally places an object 6.0 cm from a thin convex lens along its axis. The lens has a focal length of 9.0 cm.
What are the respective values of the image distance and magnification?
a. q=3.0 cm and M=−0.50
b. q=−18 cm and M=3.0
c. q=−18 cm and M=−3.0
d. q=18 cm and M=3.0
____ 21. Which of the following effects is the result of the fact that the index of refraction of glass will vary with
wavelength?
a. mirages
b. chromatic aberration
c. spherical aberration
d. light scattering
____ 22. Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following
effects?
a. spherical aberration
b. mirages
c. chromatic aberration
d. light scattering
____ 23. Bubble “A” for this question.
a. A
c. C
b. B
d. D
7
ID: A
Exam 3--PHYS 102--S13
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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15.
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22.
23.
ANS:
ANS:
ANS:
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ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
TOP:
ANS:
TOP:
ANS:
TOP:
ANS:
ANS:
ANS:
ANS:
ANS:
D
PTS: 1
DIF: 1
TOP: 22.2 Reflection and Refraction
A
PTS: 1
DIF: 2
TOP: 22.3 The Law of Refraction
B
PTS: 1
DIF: 2
TOP: 22.3 The Law of Refraction
A
PTS: 1
DIF: 2
TOP: 22.3 The Law of Refraction
D
PTS: 1
DIF: 2
TOP: 22.7 Total Internal Reflection
D
PTS: 1
A
PTS: 1
A
PTS: 1
B
PTS: 1
A
PTS: 1
A
PTS: 1
B
PTS: 1
C
PTS: 1
D
PTS: 1
A
PTS: 1
DIF: 1
TOP: 23.1 Flat Mirrors
B
PTS: 1
DIF: 2
23.2 Images Formed by Spherical Mirrors | 23.3 Convex Mirrors and Sign Conventions
B
PTS: 1
DIF: 2
23.2 Images Formed by Spherical Mirrors | 23.3 Convex Mirrors and Sign Conventions
C
PTS: 1
DIF: 1
23.2 Images Formed by Spherical Mirrors | 23.3 Convex Mirrors and Sign Conventions
B
PTS: 1
DIF: 1
TOP: 23.5 Atmospheric Refraction
B
PTS: 1
DIF: 2
TOP: 23.6 Thin Lenses
B
PTS: 1
DIF: 1
TOP: 23.7 Lens and Mirror Aberrations
A
PTS: 1
DIF: 1
TOP: 23.7 Lens and Mirror Aberrations
A
PTS: 1
1