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 was 77.7; the median was 81.
Click here to see page1 page2 of the formula sheet that came with
A double-slit experiment is set up as shown in the following figure.
Light from a laser illuminates a pair of slits etched in an opaque
barrier. The spacing between the slits is 10-4 m; the
distance from the barrier containing the slits to a viewing screen is 2
m. Because of diffraction, a pattern of light and dark spots is seen on
the viewing screen. The distance from the central bright spot to the
first bright spots on either side is 10-2 m.
What is the wavelength of the laser light illuminating the pair of
(a) 2.00 × 10-6 nm
(b) 107 nm
(c) 1.22 × 105 nm
(d) 500 nm
(e) 610 nm
(a) increase by 100%.
(b) increase by 50%.
(c) remain unchanged.
(d) decrease by 50%.
(e) decrease by 100%.
Two lenses are placed along a principal axis separated by 40 cm. The
lens on the left in the figure below has a focal length of 10 cm while
the lens on the right has a focal length of 20 cm. An object (the
arrow) is placed 15 cm to the left of the first lens.
The two lens system forms an image of the arrow. Where is it?
(a) 10 cm to right of second lens
(b) 20 cm to left of second lens
(c) 3.33 cm to right of second lens
(d) 6.67 cm to left of second lens
(e) 3.33 cm to right of second lens
(a) MT = -4.0
(b) MT = -2.0
(c) MT = -1.67
(d) MT = -1.33
(e) MT = -1.0
What is the angular separation between the red light and the blue
light when the rays leave the prism?
(a) 3.00 V/m.
(b) 9.00 × 108 V/m.
(c) 1.60 × 10-19 V/m.
Unpolarized light with intensity I0 is incident on a stack
of three linear polarizers with transmission axis oriented as shown
Calculate I3, the intensity of the light transmitted by
the entire stack of polarizers.
(a) I3 = 0
(b) I3 = 3I0 /32
(c) I3 = 3I0 /16
(a) B3= 0.433 B1
(b) B3= 0.500 B1
(c) B3= 0.866 B1
(b) remain the same.
Two flat mirrors of width 2 m and height 2 m are attached to the front
wall and left wall inside a room as shown in the Figure. The two
mirrors are perpendicular to each other. An object of height 1 m is
placed at location B, which is 1.6 m away from the left mirror and 0.8 m
away from the front mirror.
How many images of object B (excluding the object itself) can be seen
by a person (of normal height) standing at position A, which is 2 m away
from both mirrors?
(a) 0.4 m
(b) 0.6 m
(c) 0.8 m
(d) 1.0 m
(e) 1.2 m
If the shape of the animal's pupil plays a role in its visual acuity,
which statement is true?
(a) The cat's eye has better horizontal than vertical
resolution, while the cow's eye has better vertical than horizontal
(b) The cat's eye has better vertical than horizontal resolution, while the
cow's eye has better horizontal than vertical resolution.
(c) The vertical and horizontal resolutions of the cat's eye are nearly
identical; the vertical and horizontal resolutions of the cow's eye are
(a) 2.79 × 1016 m.
(b) 3.22 m.
(c) 0.31 m.
In the following circuit the frequency f is tuned to maximize
the RMS current flowing through the resistor. (Recall that
ω = 2πf.)
The correct value of f is
(a) 31.6 Hz
(b) 377 Hz
(c) 5033 Hz
A mirror is made by spraying reflector paint on the inside of a
portion of the surface of a sphere as shown. The location of the
center of this sphere is indicated. An image (either real or virtual)
of the object in the figure may be formed by this mirror. Assume that
the approximations for an ideal concave mirror are valid (i.e., the rays
make small angles with the optical axis).
In which region will this image be located?
(a) region I (to the left of the center of curvature)
(b) region II (between the center of curvature and the focus)
(c) region III (between the focus and the surface of the mirror)
(d) region IV (to the right of the mirror)
(e) No image is formed.
(a) |m| = 1
(b) |m| < 1
(c) |m| > 1
The screen is illuminated from the left by a light source of
wavelength λ. The particular light rays leaving the slits
and converging at one point on the viewing screen are drawn in the
diagram. The path lengths from the slits to that point on the screen
differ for each of the rays. (The path length differences relative to
the top-most ray are shown in the figure.)
The intensity of the light measured at the point of
convergence of the rays is I6. After the measurement
is made, all but one of the slits are covered and an intensity
I1 is measured. What is the ratio of the intensities
I6 / I1 ?
(a) I6 / I1 = 0
(b) I6 / I1 = 2
(c) I6 / I1 = 4
(d) I6 / I1 = 9
(e) I6 / I1 = 36
An object (another arrow!) is placed 30 cm behind a lens with focal
length of 20 cm.
The image that is formed is
(a) upright and enlarged.
(b) inverted and enlarged.
(c) inverted and smaller.
(a) n2 > n1
(b) n2 < n1
Two parallel rays propagating parallel to the principal axis enter a
two lens system as shown above. The separation between the two rays
entering the first lens is 0.5 cm. The first lens has focal length 10
cm, while the second lens has an unknown focal length. In addition the
separation between the two lenses is not known, except that it is
greater than 10 cm. When the light leaves the second lens the rays are
parallel and propagate parallel to the principal axis, now separated by
The lenses are separated by:
(a) 2.5 cm
(b) 5.0 cm
(c) 10.0 cm
(d) 14.14 cm
(e) 20.0 cm
Green light of wavelength λ = 560 nm is normally incident
on the lens. In order to minimize reflections from the front of the
lens, the thickness of the coating should be
(a) t = 1.22 nm
(b) t = 108 nm
(c) t = 280 nm
(d) t = 560 nm
(e) t = 1120 nm