Name: ________________________ Class: ___________________ Date: __________
ID: A
phy105s12-sample questions for chapters 22, 23, 24, and 25-goderya
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Before light can undergo total internal reflection
when incident on material 2 from material 1, what
must be true of the indices of refraction?
a. n1 = n2 b. n1 < n2 c. n1 > n2 d. Either n1 or n2
must be equal to 1.
7. 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. 1/4 b. 1/2 c. 1 d. 2
2. When the reflection of an object is seen in a plane
mirror, the image is:
a. real and upright. b. real and inverted.
c. virtual and upright. d. virtual and inverted.
8. A Fraunhofer diffraction pattern is created by
monochromatic light shining through which of the
following?
a. single slit b. double slit c. triple slit
d. more than 3 slits
3. 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. 10 cm c. 12 cm d. 6.0 cm
9. Polarization of light can be achieved using a
dichroic material like Polaroid by which of the
following processes?
a. reflection b. double refraction c. selective
absorption d. scattering
4. A goldfish is swimming in water (n = 1.33) inside a
spherical plastic bowl of index of refraction 1.33. If
the goldfish is 10 cm from the front wall of the
15-cm radius bowl, where does the goldfish appear
to an observer in front of the bowl?
a. 6.0 cm behind the plastic b. 7.0 cm behind the
plastic c. 8.0 cm behind the plastic d. 9.0 cm
behind the plastic
10. A diverging lens will be prescribed by the eye
doctor to correct which of the following?
a. myopia b. presbyopia c. hyperopia
d. astigmatism
11. A lens with a focal length of 10 cm has what
power?
a. 10.0 diopters b. 0.1 diopters c. 1 diopters
d. -10.0 diopters
5. An object is placed at a distance of 50 cm from a
thin lens along the axis. If a real image forms at a
distance of 40 cm from the lens, on the opposite
side from the object, what is the focal length of the
lens?
a. 22 cm b. 45 cm c. 90 cm d. 200 cm
12. Three thin lenses, each of focal length f, are placed
in contact. What is the resulting focal length of the
combination?
a. f b. 3f c. f/3 d. 3/f
6. If a wave from one slit of a Young’s double-slit
set-up arrives at a point on the screen one
wavelength behind the wave from the other slit,
what is observed at that point?
a. dark fringe b. bright fringe c. multi-colored
fringe d. gray fringe, neither dark nor bright
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ID: A
phy105s12-sample questions for chapters 22, 23, 24, and 25-goderya
Answer Section
MULTIPLE CHOICE
1. ANS: C
DIF: 2
TOP: 22.7 Total Internal Reflection
2. ANS: C
DIF: 1
TOP: 23.1 Flat Mirrors
3. ANS: D
DIF: 2
TOP: 23.2 Images Formed by Concave Mirrors | 23.3 Convex Mirrors and Sign Conventions
4. ANS: D
DIF: 3
TOP: 23.4 Images Formed by Refraction
5. ANS: A
DIF: 1
TOP: 23.6 Thin Lenses
6. ANS: B
DIF: 1
TOP: 24.2 Young’s Double-Slit Experiment
7. ANS: B
DIF: 1
TOP: 24.2 Young’s Double-Slit Experiment
8. ANS: A
DIF: 1
TOP: 24.6 Diffraction | 24.7 Single-Slit Diffraction
9. ANS: C
DIF: 1
TOP: 24.9 Polarization of Light Waves
10. ANS: A
DIF: 1
TOP: 25.2 The Eye
11. ANS: A
DIF: 2
TOP: 25.2 The Eye
12. ANS: C
DIF: 2
TOP: 23.6 Thin Lenses
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