An unpolarized beam of light is incident on a pane of glass (n = 1.56) such that the reflected component coming off the glass is completely polarized. What is the angle of incidence in this case?

1
An unpolarized beam of light is incident on a
pane of glass (n 1.56) such that the reflected
component coming off the glass is completely
polarized. What is the angle of incidence in this
case?

1. 32.7
2. 41.0
3. 49.0
4. 57.3

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2
A beam of light of 650 nm wavelength is incident
along the normal to two closely spaced parallel
glass plates. For what air gap separation between
the plates will the transmitted beam be of
maximum intensity? (1 nm 10-9 m)

1. 81 nm
2. 163 nm
3. 325 nm
4. 488 nm

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3
Two closely spaced parallel glass plates are
separated by 750 nm. What wavelength light source
in the visible region (390 nm - 710 nm) will
experience maximum transmission through the two
plates?

1. 500 nm
2. 429 nm
3. 600 nm
4. 684 nm

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4
Two flat glass plates are in contact along one
end and are separated by a sheet of paper 4.0 x
10-6 m thick at the other end. The top plate is
illuminated by a monochromatic light source of
490 nm wavelength. How many dark parallel bands
will be evident across the top plate? (1 nm
10-9 m)

1. 7
2. 9
3. 13
4. 17

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5
When the sun is located near one of the horizons,
an observer looking at the sky directly overhead
will view partially polarized light. This effect
is due to which of the following processes?

1. reflection
2. double refraction
3. selective absorption
4. scattering

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6
Light of wavelength 610 nm is incident on a slit
of width .20 mm and an interference pattern is
produced on a screen that is 1.5 m from the slit.
What is the width of the central bright fringe?
(1 nm 10-9 m)

1. 0.68 cm
2. 0.92 cm
3. 1.22 cm
4. 1.35 cm

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7
Light of wavelength 610 nm is incident on a slit
of width .20 mm and an interference pattern is
produced on a screen that is 1.5 m from the slit.
What is the distance of the second dark fringe as
measured from the center of the bright fringe? (1
nm 10-9 m)

1. 0.68 cm
2. 0.92 cm
3. 1.22 cm
4. 35 cm

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8
Polarization of light can be achieved using a
dichroic material like polaroid by which of the
following processes?

1. reflection
2. double refraction
3. selective absorption
4. scattering

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9
Polarization of light can be achieved using
birefringent materials by which of the following
processes?

1. reflection
2. double refraction
3. selective absorption
4. scattering

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10
A silicon monoxide (n 1.45) film of 270 nm
thickness is used to coat a glass camera lens (n
1.56). What wavelength of light in the visible
region (390 to 710 nm) will be most efficiently
transmitted by this system? (1 nm 10-9 m)

1. 409 nm
2. 492 nm
3. 522 nm
4. 638 nm

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11
What wavelength monochromatic source in the
visible region (390 to 710 nm) can be used to
constructively reflect off a soap film (n 1.46)
if the film is 77 nm thick? (1 nm 10-9 m)

1. 409 nm
2. 430 nm
3. 450 nm
4. 558 nm

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12
What wavelength monochromatic source in the
visible region (390 to 710 nm) can be used to
constructively reflect off a soap film (n 1.46)
if the film is 240 nm thick? (1 nm 10-9 m)

1. 467 nm
2. 562 nm
3. 587 nm
4. 480 nm

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13
A silicon monoxide (n 1.45) film of 100 nm
thickness is used to coat a glass camera lens (n
1.56). What wavelength of light in the visible
region (390 to 710 nm) will be most efficiently
transmitted by this system? (1 nm 10-9 m)

1. 400 nm
2. 492 nm
3. 624 nm
4. 580 nm

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14
A light source simultaneously emits light of two
wavelengths, 480 nm and 560 nm, respectively. The
source is used in a double-slit interference
experiment where the slit spacing is 0.04 mm and
the distance between double slits and the screen
is 1.2 m. What is the separation between the
second-order bright fringes of the two
wavelengths as they appear on the screen? (1 nm
10-9 m)

1. 0.16 cm
2. 0.32 cm
3. 0.48 cm
4. 0.64 cm

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15
A Young's double slit apparatus is set up where a
screen is positioned 1.6 m from the double slits
and the spacing between the two slits is 0.04 nm.
If the distance between alternating bright
fringes is 1.42 cm, what is the light source
wavelength? (1 nm 10-9 m)

1. 430 nm
2. 490 nm
3. 280 nm
4. 355 nm

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16
A Young's double slit apparatus is set up where a
screen is positioned 0.8 m from the double slits.
If the distance between alternating bright
fringes is 0.95 cm and the light source has a
wavelength of 580 nm, what is the separation of
the double slits? (1 nm 10-9 m)

1. 2.8 x 10-5 m
2. 4.9 x 10-5 m
3. 5.6 x 10-5 m
4. 6.0 x 10-5 m

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17
A Young's double slit apparatus is set up where
the source wavelength is 430 nm and the double
slit spacing is 0.04 mm. At what distance from
the double slits should the screen be placed if
the spacing between alternating bright fringes is
to be 2.4 cm? (1 nm 10-9 m)

1. 1.6 m
2. 2.23 m
3. 2.4 m
4. 2.9 m

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18
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
0.04 mm. What is the distance between alternating
bright fringes on the screen if the light source
has a wavelength of 630 nm? (1 nm 10-9 m)

1. 0.016 m
2. 0.025 m
3. 0.032 m
4. 0.047 m

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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 tripled?

1. 1/9
2. 1/3
3. 1.0
4. 3.0

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20
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 and screen is tripled?

1. 1/9
2. 1/3
3. 1.0
4. 3.0

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21
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 tripled?

1. 1/9
2. 1/3
3. 1.0
4. 3.0

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22
A Fraunhofer diffraction pattern is created by
monochromatic light shining through which of the
following?

1. single slit
2. double slit
3. triple slit
4. more than 3 slits

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23
The dark spot observed in the center of a
Newton's rings pattern is attributed to which of
the following?

1. polarization of light when reflected
2. polarization of light when refracted
3. phase shift of light when reflected
4. phase shift of light when refracted

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24
In order to produce a sustained interference
pattern by light waves from multiple sources,
which of the following conditions must be met?

1. sources are coherent
2. sources are monochromatic
3. sources are either coherent or monochromatic
4. none of these

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25
What is the minimum thickness of a soap bubble
film (n 1.46) on which light of wavelength 500
nm shines, assuming one observes constructive
interference of the reflected light?

1. 63 nm
2. 86 nm
3. 125 nm
4. 172 nm

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26
Light of wavelength 500 nm shines on a soap
bubble film (n 1.46). For what soap film
thickness, other than the minimum thickness, will
constructive interference occur?

1. 63 nm
2. 86 nm
3. 172 nm
4. 257 nm

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27
A silicon monoxide thin film (n 1.45) of
thickness 97.4 nm is applied to a camera lens
made of glass (n 1.58). This will result in a
destructive interference for reflected light of
what wavelength?

1. 720 nm
2. 616 nm
3. 565 nm
4. 493 nm

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28
A Young's double slit has a slit separation of
3.0 x 10-5 m on which a monochromatic light beam
is directed. The resultant bright fringe
separation is 2.15 x 10-2 m on a screen 1.2 m
from the double slit. What is the separation
between the third order bright fringe and the
zeroth order fringe?

1. 60 x 10-2 m
2. 6.45 x 10-2 m
3. 4.30 x 10-2 m
4. 2.15 x 10-2 m

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29
A beam of unpolarized light in air strikes a flat
piece of glass at an angle of incidence of
57.33. If the reflected beam is completely
polarized, what is the index of refraction of the
glass?

1. 1.60
2. 1.56
3. 1.52
4. 2.48

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30
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?

1. dark fringe
2. bright fringe
3. multi-colored fringe
4. grey fringe, neither dark nor bright

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31
The blue tint of a coated camera lens is largely
caused by what effects?

1. diffraction
2. refraction
3. polarization
4. interference

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32
A Young's double slit has a slit separation of
4.0 x 10-5 m on which a monochromatic light beam
is directed. The resultant bright fringes on a
screen 1.20 m from the double slit are separated
by 2.15 x 10-2 m. What is the wavelength of this
beam? (1 nanometer 10-9 m)

1. 573 nm
2. 454 nm
3. 717 nm
4. 667 nm

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33
Interference effects observed in the early 1800's
were instrumental in supporting a concept of the
existence of which property of light?

1. polarization
2. particle nature
3. wave nature
4. electro-magnetic character

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34
If the polarizing angle for cubic zirconia is
65.6, what is the index of refraction of this
material?

1. 2.00
2. 2.20
3. 2.42
4. 2.65

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35
The critical angle for sapphire surrounded by air
is 34.4. Calculate the polarizing angle for
sapphire.

1. 60.5
2. 59.7
3. 58.6
4. 56.3

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36
Sunlight reflected from a smooth ice surface is
completely polarized. Determine the angle of
incidence. (nice 1.309)

1. 25.60
2. 47.89
3. 52.62
4. 56.26

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37
A hair is placed at one edge between two flat
glass plates. When this arrangement is
illuminated with yellow light of wavelength ( ?
600 nm), a total of 121 dark bands are counted
starting at the point of contact between the
plates. How thick is the hair?

1. 3.6 x 10-5 m
2. 1.8 x 10-5 m
3. 3.6 x 10-4 m
4. 1.8 x 10-4 m

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38
A thin film of magnesium fluoride (n 1.38) is
used to coat a camera lens (n 1.56). Which of
the following thicknesses of coating will not
allow any strong reflections in the visible
spectrum ( ? 390 nm to ? 700 nm)?

1. 1 x 10-5 cm
2. 2 x 10-5 cm
3. 5 x 10-5 cm
4. 1 x 10-4 cm

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39
How far above the horizon is the moon when its
image reflected in calm water is completely
polarized? (nwater 1.333)

1. 7.7
2. 16.6
3. 22.2
4. 36.87

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40
A possible means for making an airplane
radar-invisible is to coat the plane with an
antireflective polymer. If radar waves have a
wavelength of 3 cm and the index of refraction of
the polymer is n 1.5, how thick would the
coating be?

1. 1 mm
2. 2 mm
3. 5 mm
4. 2 cm

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41
The blue light from the sky has been polarized by?

1. selective absorption.
2. reflection.
3. double refraction.
4. scattering.

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42
A Young's interference experiment is conducted
with blue-green argon laser light ( ? 515 nm).
The separation between the slits is 0.5 mm and
the interference pattern appears on a screen 3.3
m away. What is the spacing between the bright
fringes?

1. 1.7 mm
2. 3.4 mm
3. 5.1 mm
4. 6.8 mm

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43
Helium-neon laser light ( ? 632.8 nm) is sent
through a 0.3 mm-wide single slit. What is the
width of the central maximum on a screen 1 m in
back of the slit?

1. 2.02 mm
2. 3.13 mm
3. 4.22 mm
4. 5.31 mm

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44
A soap bubble (n 1.35) is floating in air. If
the thickness of the bubble wall is 300 nm, which
of the following wavelengths of visible light is
strongly reflected?

1. 620 nm (red)
2. 580 nm (yellow)
3. 540 nm (green)
4. 500 nm (blue)

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45
A thin layer of oil (n 1.25) is floating on
water (n 1.33). How thick is the oil in the
region that reflects green light ( ? 530 nm)?

1. 212 nm
2. 313 nm
3. 404 nm
4. 500 nm

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46
When light from a single point passes through
calcite it often forms two images, each of which
is formed from light that has been polarized by?

1. selective absorption.
2. reflection.
3. double refraction.
4. scattering.

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47
Light is reflecting off a wedge-shaped thin piece
of glass producing bright and dark interference
fringes. If a certain location has a bright
fringe, a nearby point will have a dark fringe if
the thickness of the glass increases by?

1. 1/8 of a wavelength of the light.
2. 1/4 of a wavelength of the light.
3. 1/2 of a wavelength of the light.
4. one wavelength of the light.

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48
Which statement is correct?

1. A double slit interference pattern does not
   require diffraction.
2. A single slit diffraction pattern does not
   require interference.
3. Diffraction, refraction, and reflection all can
   cause the path of light not to be a straight line
   path.
4. Polarization involves interference.

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49
Polaroid sunglasses help when skiing on snow on a
sunny day by reducing the sunlight from the snow.
This light from the snow has been polarized by?

1. selective absorption.
2. reflection.
3. double refraction.
4. scattering.

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50
Polaroid material made from a dichroic substance
polarizes light by?

1. selective absorption.
2. reflection.
3. double refraction.
4. scattering.

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51
When light passes from a material with a high
index of refraction into material with a low
index of refraction?

1. none of the light is reflected.
2. some light is reflected without a change of
   phase.
3. some light is reflected with a 180 change of
   phase.
4. the light that is not reflected has a 108 change
   of phase.

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52
When light shines on a lens placed on a flat
piece of glass, interference occurs which causes
circular fringes called Newton's rings. The two
beams that are interfering come from?

1. the top and bottom surface of the lens.
2. the top surface of the lens and the top surface
   of the piece of glass.
3. the bottom surface of the lens and the top
   surface of the piece of glass.
4. the top and bottom surface of the flat piece of
   glass.

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53
The center spot of Newton's rings is dark. This
destructive interference occurs because?

1. the two beams travel distances that are different
   by half a wavelength.
2. both waves change phase by 180 as they are
   reflected.
3. one beam changes phase by 180 when it is
   reflected.
4. both waves have a trough.

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54
If the 2nd order fringe in Young's double slit
experiment occurs at an angle of 45, what is the
relationship between the wavelength ? and the
distance between slits, d?

1. d 1.414?
2. d 2 ?
3. d 2.83 ?
4. d 4 ?

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55
Two beams of coherent light are shining on the
same piece of white paper. When referring to the
crests and troughs of such waves, darkness will
occur on the paper where?

1. the crest from one wave overlaps with the crest
   from the other.
2. the crest from one wave overlaps with the trough
   from the other.
3. the troughs from both waves overlap.
4. darkness cannot occur as the two waves are
   coherent.

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56
After light from a source passes through two
slits, a first order bright spot is seen on the
wall at point P. Which distance is equal to the
wavelength of the light?

1. the extra distance one beam must travel
2. the distance between beams as they leave the slit
3. the distance of point P from the central point of
   the interference pattern
4. the distance between slits

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57
Waves from a radio station with a wavelength of
400 m arrive at a home receiver a distance 30 km
away from the transmitter by two paths. One is a
direct-line path and the second by reflection
from a mountain directly behind the receiver.
What is the minimum distance between the mountain
and receiver such that destructive interference
occurs at the location of the listener?

1. 100 m
2. 200 m
3. 300 m
4. 400 m

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58
At what angle is the sun above the horizon if its
light is found to be completely polarized when it
is reflected from the top surface of a slab of
glass (n 1.65)?

1. 31.2
2. 44.4
3. 58.8
4. 66.6

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59
A Fraunhofer diffraction pattern is produced on a
screen 1.3 m from a single slit. If a light
source of 560 nm is used and the distance from
the center of the central bright fringe to the
first dark fringe is 5.3 x 10-3 m, what is the
slit width? (1 nm 10-9 m)

1. 0.69 x 10-4 m
2. 1.37 x 10-4 m
3. 1.00 x 10-4 m
4. 0.81 x 10-4 m

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60
Two flat glass plates are in contact along one
end and are separated by a sheet of tissue paper
at the other end. A monochromatic source of 490
nm illuminates the top plate. If 21 dark bands
are counted across the top plate, what is the
paper thickness? (1 nm 10-9 m)

1. 2.7 x 10-6 m
2. 3.4 x 10-6 m
3. 4.9 x 10-6 m
4. 5.8 x 10-6 m

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