Name: ________________________ Class: ___________________ Date: __________
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
2 cm high; the image is 8 cm high. The center of
curvature of the mirror is 16 cm. Where is the
object located?
a.
b.
c.
d.
4. Consider the rays drawn for this concave mirror.
Which ray(s) is/are drawn incorrectly?
a.
b.
c.
d.
e.
12 cm
16 cm
8 cm
6 cm
Ray 1
Ray 2
Ray 3
Rays 1 & 2
All are drawn incorrectly
5. What kind of mirror produces a virtual image that
is larger than the object?
a. convex
b. concave
c. flat
d. both a & b
2. A convex mirror has a focal length of 10 cm. An
object is 10 cm from the mirror. Where is the
image located?
a. 10 cm
b. 20 cm
c. there is no image
d. 5 cm
6. Which of these ray(s) is/are drawn incorrectly?
3. This shows an optical device and the image it
creates. What kind of lens or mirror is it?
a.
b.
c.
d.
a.
b.
c.
d.
e.
convex lens
concave lens
convex mirror
concave mirror
1
#1
#2
#3
#1 & #2
none are incorrect
9. Farsightedness is corrected with a convex lens.
What type of device is this?
7. A convex lens can produce:
I. a virtual image
II. a real image
III. a magnified image
IV. an upright image
a. I
b. II
c. III & IV
d. I, II, and III
e. all of these
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?
8. A convex lens has a focal length of 30 cm. An
object is 60 cm from the lens. What is the
magnification?
a.
b.
c.
d.
e.
converging
diverging
either, it depends on the severity of the vision
problem
there is no image
+1.5
-1
1
+
2
+2
a.
b.
c.
d.
2
1/2
1.5
3
11. Consider this 2-lens system. What is its final magnification?
a.
b.
c.
+2
-0.67
-3
d.
e.
-1.5
+1
12. If the Earth’s atmosphere no longer existed, how
would the time of sunset be affected?
a.
b.
c.
d.
13. Lenses experience which of these aberrations:
I. Spherical Aberration
II. Chromatic Aberration
a. I
b. II
c. I & II
d. neither of these
Sunset would occur earlier
Sunset would occur later
Sunset time would not change
No way to tell
2
18. A Young's double-slit apparatus is set up. A screen
is positioned 1.60 m from the double slits and the
spacing between the two slits is 0.040 0 mm. The
distance between the central and 1st bright fringes
is 1.42 cm. What is the light source wavelength?
14. A camera can focus on different objects by
changing the distance between the lens and film.
When is this distance the largest?
a. when the object is far away
b. when the object is nearby
c. it depends on the size of the image
d. none of these
15. When two waves are offset by one 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.
490 nm
280 nm
355 nm
710 nm
19. In a Young's double-slit interference apparatus, by
what factor is the distance between adjacent light
and dark fringes changed when the separation
between slits is doubled?
a. 1
b. 1/2
c. 2
d. 1/4
0°
45°
90°
180°
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 dark fringe
(with the arrow)?
17. Two waves of wavelength 4 meters travel through
space. The first wave travels 8 meters. The second
wave travels 10 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.
a.
b.
c.
d.
3
2λ
2λ
3λ
3λ
25. What caused the diffraction pattern in this picture?
21. A single slit is used to create an interference
pattern on a screen. If you increase the width of
the slit, what happens to the width of the central
bright fringe?
a.
b.
c.
d.
it is wider
it is narrower
it remains the same
it immediately vanishes
22. A diffraction grating has 4000 lines/cm. What is
the slit separation?
a.
b.
c.
d.
a.
0.4x10-6 m
0.25x10-6
2.5x10-6 m
4.0x10-6 m
b.
c.
d.
23. What is the highest order maximum for wavelength
450 nm than can be obtained with a grating whose
slit separation is 1.7x10 -6 m?
a.
b.
c.
d.
26. What is your favorite class?
a. Physics
b. Physics
c. Physics
d. Physics
6
3
7
4
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?
a.
b.
c.
d.
light incident on a circular object (such as a
penny)
light from a light bulb incident on a double slit
a laserbeam incident on a single slit
none of these
15.5°
53°
24°
No second order maximum will occur in this
case.
4
ID: A
Exam 4--PHYS 102--S15
Answer Section
MULTIPLE CHOICE
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D
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C
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A
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A
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S15-2M
S15-2M
S15-PHYS 102-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15--WWP,2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15-2M
S15--2M
S15
S15
S15
1