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Exam 4--PHYS 102--S15
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. A mirror produces an upright image. The object is
8 cm high and to the left of the mirror; the image is
4 cm high. The center of curvature of the mirror is
16 cm. Where is the image located?
3. This shows an optical device and the image it
creates. What kind of lens or mirror is it?
a.
b.
c.
d.
convex lens
concave lens
convex mirror
concave mirror
4. Consider the rays drawn for this concave mirror.
Which ray(s) is/are drawn incorrectly?
a.
b.
c.
d.
e.
16 cm to the righ of the mirror
at the mirror’s focal point
8 cm to the right of the mirror
4 cm to the right of the mirror
8 cm to the left of the mirror
a.
b.
c.
d.
e.
2. A security mirror has a focal length of 20 cm. If
you stand 40 cm from the mirror, what is its
magnification?
a.
b.
c.
d.
-2
+1
-8
1
+
3
1
Ray 1
Ray 2
Ray 3
Rays 1 & 2
All are drawn incorrectly
8. A concave lens can produce:
I. a virtual image
II. a real image
III. a magnified image
IV. an upright image
a. I
b. II
c. I & IV
d. I, II, and III
e. all of these
5. A convex lens has a focal length of 30 cm. An
object is 10 cm from the lens. What is the
magnification?
a.
b.
c.
d.
e.
1
2
+3
there is no image
1
−
3
+1.5
+
9. Nearsightedness is corrected with a concave lens.
What type of device is this?
6. What kind of mirror produces a virtual image that
is smaller than the object?
a. convex
b. concave
c. flat
d. both a & b
a.
b.
c.
10. A person uses a converging lens that has a focal
length of 10 cm to inspect a gem. The lens forms a
virtual image 20 cm away. What is the magnitude
of the magnification?
7. Which of these ray(s) is/are drawn incorrectly?
a.
b.
c.
d.
e.
#1
#2
#3
#1 & #3
none are incorrect
a.
b.
c.
d.
11. Consider this 2-lens system. What is the final magnification?
a.
-3
d.
b.
2.5
e.
c.
+3
converging
diverging
either, it depends on the severity of the vision
problem
+1
1
2
2
1/2
3
2
1.5
12. What causes a mirage you see while driving on a
road?
a.
b.
c.
d.
17. Two waves of wavelength 4 meters travel through
space. The first wave travels 8 meters. The second
wave travels 12 meters. When they meet, what
type of interference occurs?
a. total constructive interference
b. total destructive interference
c. neither total constructive nor total destructive
interference occurs.
the refraction of light in warm air
the reflection of light on the road
the reflection of light from the atmosphere
the refraction of light at your windshield
13. Mirrors experience which of these aberrations:
18. In a Young's double-slit interference apparatus, by
what factor is the distance between adjacent light
and dark fringes changed when the wavelength of
the source is doubled?
a. 1/4
b. 2
c. 1
d. 1/2
I. Spherical Aberration
II. Chromatic Aberration
a.
b.
c.
d.
I
II
I & II
neither of these
19. A Young's double-slit apparatus is set up so that a
screen is positioned 1.6 m from the double slits and
the spacing between the two slits is 0.040 mm.
What is the distance between the central and 1st
bright fringes on the screen if the light source has a
wavelength of 630 nm?
14. The human eye has a lens that can change its focal
length. When is the focal length of the eye’s lens
the largest?
a. when the object is far away
b. when the object is near
c. when the eye is out of focus
d. none of these
15. When two waves are offset by one-half of a
wavelength, they experience ____________.
a. total constructive interference
b. total destructive interference
c. interference, but not total constructive or
destructive intereference
d. none of these; it depends on the wavelength
16. These two waves are offset because they’ve
travelled diffent pathlengths. By what amount are
they out of phase?
a.
b.
c.
d.
a.
b.
c.
d.
0°
45°
90°
180°
3
0.047 m
0.025 m
0.016 m
0.032 m
24. At what angle with the second order maximum
occur for a wavelength of 400 nm using a
diffraction grating with 10000 lines per cm?
20. This figure shows a double-slit diffraction pattern.
What is the path-length difference of the light rays
that interfere to produce the designated bright
fringe (with the arrow)?
a.
b.
c.
d.
2λ
2λ
3λ
3λ
21. A single slit is used to create an interference
pattern on a screen. If you increase the wavelength
of the light, what happens to the width of the
central bright fringe?
a.
b.
c.
d.
a.
b.
c.
it is wider
it is narrower
it remains the same
it immediately vanishes
d.
15.5°
24°
No second order maximum will occur in this
case.
53°
25. What caused the diffraction pattern in this picture?
22. A diffraction grating has 4000 lines/cm. What is
the slit separation?
a. 4.0x10-6 m
b. 0.25x10-6
c. 2.5x10-6 m
d. 0.4x10-6 m
23. What is the highest order maximum for wavelength
450 nm than can be obtained with a grating with
slit separation of 1.7x10 -6 m?
a.
b.
c.
a.
b.
c.
d.
d.
3
4
6
7
light from a light bulb incident on a double slit
a laserbeam incident on a single slit
light incident on a circular object (such as a
penny)
none of these
26. What is your favorite class?
a. Physics
b. Physics
c. Physics
d. Physics
4
ID: A
Exam 4--PHYS 102--S15
Answer Section
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S15-WWP
S15-WWP
S15-PHYS 102-WWP
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