True-false questions are worth 2 points each, three-choice multiple
choice questions are worth 3 points each, five-choice multiple choice
questions are worth 6 points each. The maximum possible score is 109.
The exam period was 90 minutes; the mean score was 91.4; the median was
93. Click here to see page1
page2 page3 of the formula sheet that came
with the exam.
Some helpful information:
• A reminder about prefixes: p (pico) = 10-12; n
(nano) = 10-9; μ (micro) = 10-6; m (milli) =
10-3; k (kilo) = 10+3; M or Meg (mega) =
10+6; G or Gig (giga) = 10+9.
(a) red light
(b) blue light
(c) green light
Orange light has a wavelength of 6 × 10-7 m in vacuum.
What is its frequency? The speed of light is 3 × 108
(a) 2 × 1015 Hz
(b) 2 × 10-15 Hz
(c) 5 × 1014 Hz
(d) 5 × 10-14 Hz
(e) 2 × 1014 Hz
(a) 4 × 10-7 m
(b) 6 × 10-7 m
(c) 9 × 10-7 m
A beam of light passes from air, through a sheet of plastic, then into
air again. The angle the incident beam makes with the normal is
θ1, and the angle the beam makes with the normal
as it passes through the plastic is θ2. The
index of refraction for air is 1 and the index of refraction for plastic
What is the value of sin θ2 in terms of
(a) sin θ2 = (1/8) sin θ1
(b) sin θ2 = (1/4) sin θ1
(c) sin θ2 = (1/2) sin θ1
(d) sin θ2 = 2 sin θ1
(e) sin θ2 = sin θ1/2
(a) θ1 = sin-1 (1/4)
(b) θ1 = sin-1 (1/2)
(c) θ1 = sin-1 2
(d) θ1 = 0o
(e) There is no such angle.
A laser emits short pulses of high-intensity electromagnetic waves.
The electric field has an rms value of Erms = 2 ×
What is the average intensity S of the laser beam?
(a) S = 5.4 × 103 W/m2
(b) S = 2.4 × 109 W/m2
(c) S = 3.6 × 1014 W/m2
(d) S = 1.1 × 1016 W/m2
(e) S = 2.7 × 1032 W/m2
(a) P = 3.2 × 103 W
(b) P = 4.4 × 105 W
(c) P = 1.2 × 107 W
(d) P = 5.0 × 109 W
(e) P = 1.7 × 1011 W
(a) beam passes through P1 first, then P2
(b) beam passes through P2 first, then P1
(c) The transmitted intensity is the same in both configurations.
A lady bug is at a distance 5 cm from a concave mirror of focal
length f = 10 cm.
What is the image distance di formed in the
(a) di = ∞
(b) di = -10 cm
(c) di = -5 cm
(d) di = 10 cm
(e) di = 20 cm
(a) di = ∞
(b) di = -10 cm
(c) di = -5 cm
(d) di = 5 cm
(e) di = 10 cm
A dentist's mirror is placed 2 cm from a tooth. An enlarged image is
located 5.6 cm behind the mirror.
What kind of mirror is being used?
(a) f = -8.4 cm
(b) f = -3.1 cm
(c) f = 3.1 cm
(d) f = 8.4 cm
(e) f = ∞
(a) 13 cm
(b) 26 cm
(c) 52 cm
An object of height 0.05 meters is located 0.6 meters in front of a
thin converging lens. The lens forms an image of the object at point A,
which is 0.3 meters beyond the lens.
What is the focal length of the lens?
(a) 0.40 m
(b) 0.20 m
(c) 0.15 m
(a) 0.025 m
(b) 0.050 m
(c) 0.075 m
(a) increase in size and move closer to the lens.
(b) increase in size and move farther away from the lens.
(c) decrease in size and move closer to the lens.
(d) decrease in size and move farther away from the lens.
(e) stay in the same place.
(a) 0.6 m left of the second lens
(b) 1.2 m left of the second lens
(c) 1.2 m right of the second lens
(d) 0.6 m right of the second lens
(e) 0.9 m right of the second lens
With unaided vision your professor can focus only on objects which
lie at distances between 3.0 meters and 0.5 meters
Which type of lens is needed to allow him to see objects beyond 3
(a) | f | = 0.5 m
(b) | f | = 1.0 m
(c) | f | = 3.0 m
(a) P = 4.1 Diopters
(b) P = 1.9 Diopters
(c) P = 0.50 Diopters
(d) P = -1.9 Diopters
(e) P = -0.50 Diopters
(a) A (from n = 1.3 to n = 1.4)
(b) B (from n = 1.4 to n = 1.2)
The person sees that there is constructive interference of reflected
light of wavelength 630 nm. What is the minimum thickness of the oil
(a) 109 nm
(b) 218 nm
(c) 436 nm
Monochromatic light is incident upon two narrow slits separated by a
distance d = 2.3 × 10-3 m before striking a screen 4.3 meters
away. The distance between the central and first bright fringe is
1.1 × 10-3 m. Calculate the wavelength of the light.
(You may approximate sin(θ) ≈ tan(θ) ≈ θ.)
(a) λ = 588 nm
(b) λ = 550 nm
(c) λ = 444 nm
(c) stays the same.