Name: 
 

Ph - Ch 14 Light


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
Which portion of the electromagnetic spectrum is used in a television?
a.
infrared waves
c.
radio waves
b.
microwaves
d.
gamma waves
 

 2. 
Which portion of the electromagnetic spectrum is used in aircraft navigation?
a.
infrared waves
c.
radio waves
b.
microwaves
d.
ultraviolet light
 

 3. 
Which portion of the electromagnetic spectrum is used in a microscope?
a.
infrared waves
c.
visible light
b.
gamma rays
d.
ultraviolet light
 

 4. 
Which portion of the electromagnetic spectrum is used to sterilize medical instruments?
a.
infrared waves
c.
X rays
b.
microwaves
d.
ultraviolet light
 

 5. 
Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?
a.
ultraviolet light
c.
infrared waves
b.
X rays
d.
gamma rays
 

 6. 
What is the wavelength of microwaves of 3.0 ´ 109 Hz frequency?
a.
0.060 m
c.
0.050 m
b.
0.10 m
d.
0.20 m
 

 7. 
What is the frequency of infrared light of 1.0 ´ 10–4 wavelength?
a.
3.0 ´ 10–2 Hz
c.
3.0 ´ 1012 Hz
b.
3.0 ´ 104 Hz
d.
3.0 ´ 102 Hz
 

 8. 
What is the frequency of an electromagnetic wave with a wavelength of 1.0 ´ 105 m?
a.
1.0 ´ 1013 Hz
c.
3.0 ´ 1013 Hz
b.
3.0 ´ 103 Hz
d.
1.0 ´ 103 Hz
 

 9. 
What is the wavelength of an infrared wave with a frequency of 4.2 ´ 1014 Hz?
a.
7.1 ´ 105 m
c.
7.1 ´ 10–7 m
b.
1.4 ´ 106 m
d.
1.4 ´ 10–6 m
 

 10. 
Yellow-green light has wavelength of 560 m. What is its frequency?
a.
5.4 ´ 106 Hz
c.
1.8 ´ 1014 Hz
b.
1.8 ´ 106 Hz
d.
5.4 ´ 1014 Hz
 

 11. 
In a vacuum, electromagnetic radiation of short wavelengths
a.
travels as fast as radiation of long wavelengths.
b.
travels slower than radiation of long wavelengths.
c.
travels faster than radiation of long wavelengths.
d.
can travel both faster and slower than radiation of long wavelengths.
 

 12. 
When red light is compared with violet light,
a.
both have the same frequency.
c.
both travel at the same speed.
b.
both have the same wavelength.
d.
red light travels faster than violet light.
 

 13. 
If you know the wavelength of any form of electromagnetic radiation, you can determine its frequency because
a.
all wavelengths travel at the same speed.
b.
the speed of light varies for each form.
c.
wavelength and frequency are equal.
d.
the speed of light increases as wavelength increases.
 

 14. 
The relationship between frequency, wavelength, and speed holds for light waves because
a.
light travels slower in a vacuum than in air.
b.
all forms of electromagnetic radiation travel at a single speed in a vacuum.
c.
light travels in straight lines.
d.
different forms of electromagnetic radiation travel at different speeds.
 

 15. 
The farther light is from a source,
a.
the more spread out light becomes.
c.
the more bright light becomes.
b.
the more condensed light becomes.
d.
the more light is available per unit area.
 

 16. 
If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is
a.
one-eighth
c.
one-half
b.
one-fourth
d.
twice
 

 17. 
Snow reflects almost all of the light incident upon it. However, a single beam of light is not reflected in the form of parallel rays. This is an example of ____ reflection off of a ____ surface.
a.
regular; rough
c.
diffuse; specular
b.
regular; specular
d.
diffuse; rough
 

 18. 
A highly polished finish on a new car provides a ____ surface for ____ reflection.
a.
rough; diffused
c.
rough; regular
b.
specular; diffused
d.
smooth; specular
 

 19. 
When incoming rays of light strike a flat mirror at an angle close to the surface of the mirror, the reflected rays are
a.
inclined high above the mirror’s surface.
b.
parallel to the mirror’s surface.
c.
perpendicular to the mirror’s surface.
d.
close to the mirror’s surface.
 

 20. 
When a straight line is drawn perpendicular to a flat mirror at the point where an incoming ray strikes the mirror’s surface, the angles of incidence and reflection are measured from the normal and
a.
the angles of incidence and reflection are equal.
b.
the angle of incidence is greater than the angle of reflection.
c.
the angle of incidence is less than the angle of reflection.
d.
the angle of incidence can be greater than or less than the angle of reflection.
 

 21. 
If a light ray strikes a flat mirror at an angle of 27° from the normal, the reflected ray will be
a.
27° from the mirror’s surface.
c.
90° from the mirror’s surface.
b.
27° from the normal.
d.
63° from the normal.
 

 22. 
If a light ray strikes a flat mirror at an angle of 14° from the normal, the reflected ray will be
a.
13° from the mirror’s surface.
c.
90° from the mirror’s surface.
b.
27° from the normal.
d.
14° from the normal.
 

 23. 
If a light ray strikes a flat mirror at an angle of 29° from the normal, the reflected ray will be
a.
29° from the normal.
c.
90° from the mirror’s surface.
b.
27° from the normal.
d.
36° from the normal.
 

 24. 
If a light ray strikes a flat mirror at an angle of 52° from the normal, the reflected ray will be
a.
52° from the normal.
c.
90° from the mirror’s surface.
b.
25° from the normal.
d.
18° from the normal.
 

 25. 
If a light ray strikes a flat mirror at an angle of 61° from the normal, the reflected ray will be
a.
61° from the mirror’s surface.
c.
90° from the mirror’s surface.
b.
27° from the normal.
d.
61° from the normal.
 

 26. 
If a light ray strikes a flat mirror at an angle of 75° from the normal, the reflected ray will be
a.
63° from the mirror’s surface.
c.
90° from the mirror’s surface.
b.
75° from the normal.
d.
63° from the normal.
 

 27. 
If a light ray strikes a flat mirror at an angle of 30° from the normal, the ray will be reflected at an angle of
a.
30° from the mirror’s surface.
c.
60° from the normal.
b.
60° from the mirror’s surface.
d.
90° from the normal.
 

 28. 
The image of an object in a flat mirror is always
a.
larger than the object.
c.
independent of the size of the object.
b.
smaller than the object.
d.
the same size as the object.
 

 29. 
When two parallel mirrors are placed so that their reflective sides face one another, ____ images form. This is because the image in one mirror becomes the ____ for the other mirror.
a.
multiple; object
c.
inverted; center of curvature
b.
reduced; virtual image
d.
enlarged; focal point
 

 30. 
If you stand 3.0 m in front of a flat mirror, how far away from you would your image be in the mirror?
a.
1.5 m
c.
6.0 m
b.
3.0 m
d.
12.0 m
 

 31. 
Which of the following best describes the image produced by a flat mirror?
a.
virtual, inverted, and magnification greater than one
b.
real, inverted, and magnification less than one
c.
virtual, upright, and magnification equal to one
d.
real, upright, and magnification equal to one
 

 32. 
When the reflection of an object is seen in a flat mirror, the distance from the mirror to the image depends on
a.
the wavelength of light used for viewing.
b.
the distance from the object to the mirror.
c.
the distance of both the observer and the object to the mirror.
d.
the size of the object.
 

 33. 
A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object?
a.
20.0 cm
c.
7.50 cm
b.
15.0 cm
d.
5.00 cm
 

 34. 
A concave mirror forms a real image at 25 cm from the mirror surface along the principal axis. If the corresponding object is at a 10.0 cm distance, what is the mirror’s focal length?
a.
1.4 cm
c.
12 cm
b.
17 cm
d.
7.1 cm
 

 35. 
A concave mirror forms a real image at 14 cm from the mirror surface along the principal axis. If the corresponding object is at a 29 cm distance, what is the mirror’s focal length?
a.
14 cm
c.
12 cm
b.
9.4 cm
d.
36 cm
 

 36. 
A concave mirror forms a real image at 17 cm from the mirror surface along the principal axis. If the corresponding object is at a 36 cm distance, what is the mirror’s focal length?
a.
19 cm
c.
12 cm
b.
47 cm
d.
26 cm
 

 37. 
A concave mirror forms a real image at 26 cm from the mirror surface along the principal axis. If the corresponding object is at a 61 cm distance, what is the mirror’s focal length?
a.
12 cm
c.
22 cm
b.
27 cm
d.
18 cm
 

 38. 
A concave mirror forms a real image at 42 cm from the mirror surface along the principal axis. If the corresponding object is at a 88 cm distance, what is the mirror’s focal length?
a.
28 cm
c.
12 cm
b.
17 cm
d.
9 cm
 

 39. 
A concave mirror forms a real image at 19 cm from the mirror surface along the principal axis. If the corresponding object is at a 39 cm distance, what is the mirror’s focal length?
a.
13 cm
c.
11 cm
b.
7 cm
d.
9 cm
 

 40. 
If a virtual image is formed 10.0 cm along the principal axis from a convex mirror with a focal length of –15.0 cm, what is the object’s distance from the mirror?
a.
30.0 cm
c.
6.0 cm
b.
12 cm
d.
3.0 cm
 

 41. 
A convex mirror with a focal length of –20.0 cm forms an image 12 cm behind the surface. Where is the object as measured from the surface?
a.
7.5 cm
c.
22 cm
b.
15 cm
d.
3.0 ´ 101 cm
 
 
ch14light_files/i0430000.jpg
 

 42. 
In the diagram above, the image of object B would be
a.
virtual, enlarged, and inverted.
c.
virtual, reduced, and upright.
b.
real, enlarged, and upright.
d.
virtual, enlarged, and upright.
 
 
ch14light_files/i0450000.jpg
 

 43. 
In the diagram above, the image of object B would be
a.
real, reduced, and upright.
c.
virtual, reduced, and inverted.
b.
virtual, enlarged, and upright.
d.
virtual, reduced, and upright.
 

 44. 
Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal-point distance from the mirror?
a.
virtual, upright, and magnification greater than one
b.
real, inverted, and magnification less than one
c.
virtual, upright, and magnification less than one
d.
real, inverted, and magnification greater than one
 

 45. 
Which best describes the image of a concave mirror when the object is at a distance greater than twice the focal-point distance from the mirror?
a.
virtual, upright, and magnification greater than one
b.
real, inverted, and magnification less than one
c.
virtual, upright, and magnification less than one
d.
real, inverted, and magnification greater than one
 

 46. 
Which 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 greater than one
b.
real, inverted, and magnification less than one
c.
virtual, upright, and magnification less than one
d.
real, inverted, and magnification greater than one
 

 47. 
When the reflection of an object is seen in a flat mirror, the image is
a.
real and upright.
c.
virtual and upright.
b.
real and inverted.
d.
virtual and inverted.
 

 48. 
When parallel rays that are also parallel to the principal axis strike a spherical mirror, rays that strike the mirror ____ the principal axis are focused at the focal point. Those rays that strike the mirror ____ the principal axis are focused at points between the mirror and the focal point.
a.
perpendicular to; far from
c.
close to; far from
b.
close to; perpendicular to
d.
far from; close to
 

 49. 
A parabolic mirror, instead of a spherical mirror, can be used to reduce the occurrence of which effect?
a.
spherical aberration
c.
chromatic aberration
b.
mirages
d.
light scattering
 

 50. 
When red light and green light shine on the same place on a piece of white paper, the spot appears to be
a.
yellow.
c.
white.
b.
brown.
d.
black.
 

 51. 
Which of the following is NOT an additive primary color?
a.
yellow
c.
red
b.
blue
d.
green
 

 52. 
What color does yellow pigment subtract from white light?
a.
blue
c.
yellow
b.
red
d.
green
 

 53. 
What color does blue pigment subtract from white light?
a.
blue
c.
violet
b.
red
d.
green
 

 54. 
Which of the following is NOT a primary subtractive color?
a.
yellow
c.
magenta
b.
cyan
d.
blue
 

 55. 
When the transmission axis is perpendicular to the plane of polarization for light,
a.
all the light passes through.
c.
little of the light passes through.
b.
most of the light passes through.
d.
no light passes through.
 
 
ch14light_files/i0590000.jpg
 

 56. 
Which pair of glasses is best suited for automobile drivers? The transmission axes are shown by straight lines on the lenses. (Hint: The light reflects off the hood of the car.)
a.
A
c.
C
b.
B
d.
D
 

 57. 
If you looked at a light through the lenses from two polarizing sunglasses that were overlapped at right angles to one another,
a.
all of the light would pass through.
c.
little of the light would pass through.
b.
most of the light would pass through.
d.
none of the light would pass through.
 

Short Answer
 
 
ch14light_files/i0630000.jpg
 

 58. 
What type of reflection is illustrated in the figure above?
 
 
ch14light_files/i0650000.jpg
 

 59. 
What type of reflection is illustrated in the figure above?
 

 60. 
When rays of light are incident upon a spherical mirror far from the principal axis, fuzzy images form. What is this characteristic of spherical mirrors?
 

 61. 
Spherical aberration may be avoided by employing a ____________________ mirror or by making sure that the diameter of a spherical mirror is sufficiently ____________________.
 

 62. 
The focal point and center of curvature of a spherical mirror all lie along the ____________________.
 

 63. 
Why are some primary colors called additive?
 

 64. 
What occurs when beams of light of three primary colors are combined?
 

 65. 
What occurs when light passed through a red filter is combined with light passed through a green filter?
 

 66. 
What occurs when yellow light is combined with blue light?
 

 67. 
What occurs when subtractive primary colors are combined?
 

 68. 
What color results when yellow and blue pigment are combined?
 

 69. 
How is the brightness of a light source affected by distance?
 

Problem
 

 70. 
A certain radio wave has a frequency of 2.0 ´ 106 Hz. What is its wavelength?
 

 71. 
Where would the image of a 4.0 cm tall object that is 12 cm in front of a flat mirror be located?
 

 72. 
A convex mirror has a focal length of –17 cm. What is the radius of curvature?
 

 73. 
A candle is 49.0 cm in front of a convex spherical mirror with a radius of curvature of 70.0 cm. Draw a ray diagram to find the position and magnification of the image.
 

 74. 
An object that is 2.00 cm high is placed 10.0 cm in front of a concave mirror with a radius of curvature of 40.0 cm. Draw a ray diagram to find the position and magnification of the image.
 

 75. 
An object is 15 cm from the surface of a spherical glass tree ornament that is 5.0 cm in diameter. Draw a ray diagram to find the position and magnification of the image.
 

 76. 
A concave spherical mirror has a radius of curvature of 10.0 cm. A candle that is 5.0 cm tall is placed 14 cm in front of the mirror. Draw a ray diagram to find the image distance and magnification.
 

 77. 
A candle 4.7 cm tall is 20.0 cm from a convex mirror that has a focal length of 6.0 cm. Draw a ray diagram to determine the position and magnification of the image.
 

 78. 
A candle 15 cm high is placed in front of a concave mirror at the focal point. The radius of curvature is 60 cm. Draw a ray diagram to determine the position and magnification of the image.
 



 
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