A diffraction grating with 10,000 lines/cm will exhibit the first order maximum for light of wavelength 510 nm at what angle? (1 nm = 10-9 m)

1
A diffraction grating with 10,000 lines/cm will
exhibit the first order maximum for light of
wavelength 510 nm at what angle? (1 nm 10-9 m)

1. 0.51
2. 0.62
3. 15.3
4. 31

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2
What resolving power must a diffraction grating
have in order to distinguish wavelengths of 630.1
and 631.7 nm?

1. 315
2. 394
3. 630.9
4. 788

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3
A camera uses a?

1. converging lens to form a real image.
2. converging lens to form an imaginary image.
3. diverging lens to form a real image.
4. diverging lens to form an imaginary image.

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4
Changing the f-number of a camera by two stops by
going from f/8 to f/16 will change the brightness
of the light hitting the film by?

1. 4.
2. 2.
3. 1/2.
4. 1/4.

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5
An individual's eye pupil changes from a diameter
of 3.5 mm to 1.5 mm as the illumination is
increased. By what factor does the minimum angle
of resolution change?

1. 0.43
2. 0.65
3. 2.0
4. 2.3

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6
While a camera has film where the image is
formed, the eye forms the image on the?

1. pupil.
2. cornea.
3. retina.
4. optic nerve.

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7
The eye changes its f-number by?

1. using the iris to change the size of the pupil.
2. using the ciliary muscle to change the focal
   length of the lens.
3. either using the ciliary muscle to change the
   focal length of the lens or using the iris to
   change the size of the pupil.
4. the eye doesn't change its f-number.

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8
A microscope has an objective lens with an
aperture diameter 0.6 cm. A monochromatic light
source of 580 nm is used to illuminate the
object. It is determined that the minimum angle
of resolution is 1.18 x 10-4 rad. If the present
lens were replaced by one with an aperture of
diameter 0.9 cm, what would the minimum angle of
resolution now become? (1 nm 10-9 m)

1. 1.50 x 10-4 rad
2. 1.77 x 10-4 rad
3. 0.88 x 10-4 rad
4. 0.79 x 10-4 rad

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9
A microscope has an objective lens with an
aperture of diameter 0.6 cm where a monochromatic
light source of 580 nm is used to illuminate the
object. It is determined that the minimum angle
of resolution is 1.18 x 10-4 rad. If the
illuminating source were replaced by a violet
source with wavelength of 420 nm, what would the
minimum angle of resolution now become? (1 nm
10-9 m)

1. 1.63 x 10-4 rad
2. 1.18 x 10-4 rad
3. 0.85 x 10-4 rad
4. 0.58 x 10-4 rad

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10
A refracting astronomical telescope has objective
and eyepiece lenses of focal lengths 20 and 0.4
cm, respectively. The separation between the two
lenses is 30 cm. What is the magnification of
this instrument?

1. 19.6
2. 27.0
3. 50.0
4. 94.0

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11
The nearpoint of a given individual's eye is 55
cm. What focal length corrective lens should be
prescribed so that an object can be clearly seen
when placed at 25 cm in front of the eye?

1. -25 cm
2. 17 cm
3. 46 cm
4. 30 cm

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12
A given individual is unable to see objects
clearly when they are beyond 100 cm. What focal
length lens should be used to correct this
problem?

1. -100 cm
2. -33.3 cm
3. -20 cm
4. 75 cm

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13
A magnifying lens with a focal length of 10 cm
has what maximum magnification? (Assume the
nearpoint is 25 cm.)

1. 7.14
2. 2.5
3. 3.0
4. 3.5

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14
A magnifying lens with a focal length of 10 cm
has what magnification when the viewing eye is
relaxed?

1. 7.14
2. 2.5
3. 3.0
4. 3.5

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15
A compound microscope has objective and eyepiece
lenses of focal lengths 0.8 and 4.0 cm,
respectively. If the microscope length is 15 cm,
what is the maximum magnification?

1. 3.2
2. 6.3
3. 48.0
4. 117.0

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16
The "normal" eye has a nearpoint of 25 cm. If a
given individual's nearpoint is 65 cm, for what
problem will the eye doctor prescribe correction?

1. myopia (nearsightedness)
2. presbyopia (loss of lens flexibility)
3. hyperopia (farsightedness)
4. astigmatism

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17
Tripling the focal length of the objective lens
of a compound microscope will change the
magnification by what factor?

1. 1/9
2. 1/3
3. 3.0
4. 9.0

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18
A diverging lens will be prescribed by the eye
doctor to correct which of the following?

1. myopia (nearsightedness)
2. presbyopia
3. hyperopia (farsightedness)
4. astigmatism

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19
Which term below identifies the eye defect
characterized by an inability to see distant
objects clearly?

1. myopia
2. presbyopia
3. hyperopia
4. astigmatism

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20
Which term below identifies the defect where the
lens produces a line image of a point source?

1. myopia
2. presbyopia
3. hyperopia
4. astigmatism

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21
Which eye defect is corrected by a lens having
different curvatures in two perpendicular
directions?

1. myopia
2. presbyopia
3. hyperopia
4. astigmatism

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22
A lens with a focal length of 20 cm has what
power?

1. 5.0 diopters
2. 6.7 diopters
3. 8.0 diopters
4. 9.6 diopters

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23
The pupil of the eye reduces in size under which
condition?

1. eye is focused on a distant object
2. eye is focused on a nearby object
3. object viewed is well illuminated
4. object viewed is dimly illuminated

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24
Two thin lenses in combination placed in contact
with each other along a common axis, have the
respective powers of 45 and -15 diopters. What is
their combined power?

1. 15 diopters
2. 30 diopters
3. 60 diopters
4. -22.5 diopters

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25
Doubling the aperture diameter of a camera lens
will change the light intensity admitted to the
film by what factor?

1. 0.25
2. 0.50
3. 2.0
4. 4.0

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26
Doubling the focal length of a telephoto lens,
while holding aperture size constant, will change
the light intensity admitted to the film by what
factor?

1. 0.25
2. 0.50
3. 2.0
4. 4.0

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27
Doubling the f-number of a camera lens will
change the light intensity admitted to the film
by what factor?

1. 0.25
2. 0.50
3. 2.0
4. 4.0

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28
Tripling the focal length in a telephoto lens,
while keeping the aperture size constant, will
change the f-number by what factor?

1. 1/9
2. 1/3
3. 3.0
4. 9.0

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29
Assume that a camera picture is taken using a
given subject. A second picture is taken of the
same subject with the same film and level of
illumination as before, but with the f-number
doubled. By what factor will the required time of
exposure change if the film is to receive the
same total light energy?

1. 0.25
2. 0.50
3. 2.0
4. 4.0

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30
The ciliary muscle is instrumental in changing
the shape of which eye part?

1. iris
2. lens
3. pupil
4. retina

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31
The ciliary muscle of the eye is relaxed under
which condition?

1. eye is focused on a distant object
2. eye is focused on a nearby object
3. subject being viewed is well illuminated
4. subject being viewed is dimly illuminated

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32
A beam of monochromatic light is incident on a
multiple slit diffraction grating with a slit
separation of 2.50 x 10-6 m. If the angle between
the normal and first order bright fringe is 14,
what is the source wavelength? (1 nm 10-9 m)

1. 430 nm
2. 500 nm
3. 605 nm
4. 647 nm

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33
The Michelson interferometer is a device that may
be used to measure which of the following?

1. magnifying power of lenses
2. light wavelength
3. atomic masses
4. electron charge

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34
What is the resolving power of a diffraction
grating which is capable of just distinguishing
between two wavelengths of 568.5 and 569.6 nm?

1. 1.1
2. 517
3. 1035
4. 1.9 x 10-3

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35
Monochromatic light of wavelength 430 nm is used
to illuminate an object through a microscope with
an objective lens aperture diameter of 0.7 cm.
Use Rayleigh's criterion to determine the
limiting angle of resolution? (1 nm 10-9 m)

1. 7.5 x 10-5 rad
2. 3.0 x 10-9 rad
3. 1.3 x 10-4 rad
4. 5.0 x 10-7 rad

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36
Tripling the aperture diameter of a camera lens
will change the f-number by what factor?

1. 1/9
2. 1/3
3. 3.0
4. 9.0

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37
A lens with focal length 5 cm is used as a
magnifying glass. To obtain maximum
magnification, how far in front of the lens
should the object be placed?

1. 5.00 cm
2. 4.16 cm
3. 10.0 cm
4. 25.0 cm

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38
The Yerkes refracting telescope has a 1 m
diameter objective lens of focal length 20 m and
an eyepiece of focal length 2.5 cm. Determine the
magnification of the planet Mars as seen through
this telescope.

1. M 200x
2. M 400x
3. M 800x
4. M 1000x

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39
The Palomar reflecting telescope has a parabolic
mirror with an 80 m focal length. Determine the
magnification achieved when an eyepiece of focal
length 2.5 cm is used.

1. 800x
2. 1200x
3. 1600x
4. 3200x

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40
White light is spread out into spectral hues by a
diffraction grating. If the grating has 2000
lines per cm, at what angle will red light ( ?
640 nm) appear in first order?

1. 3.57
2. 7.35
3. 11.17
4. 13.35

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41
A binary star in the constellation Orion has an
angular separation between the stars of 10-5
radians. If ? 500 nm, what is the smallest
aperture (diameter) telescope that will just
resolve the two stars?

1. 3.0 cm
2. 4.2 cm
3. 6.1 cm
4. 12.6 cm

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42
Find the radius of a star image formed on the
retina of the eye if the aperture diameter (the
pupil) at night is 0.7 cm and the length of the
eye is 3.0 cm. Assume the wavelength of starlight
in the eye is 500 nm.

1. 2.6 x 10-4 m
2. 5.2 x 10-4 m
3. 3.1 x 10-5 m
4. 2.6 x 10-6 m

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43
A helium-neon laser ( ? 632.8 nm) is used to
calibrate a diffraction grating. If the
first-order maximum occurs at 20.5, what is the
line spacing, d?

1. 1.808 x 10-6 m
2. 3.616 x 10-6 m
3. 5.424 x 10-6 m
4. 7.232 x 10-6 m

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44
The 2.4 m Hubble space telescope has been placed
into Earth orbit by the space shuttle. What
angular resolution could this telescope achieve
by Rayleigh's criterion? ( ? 500 nm).

1. 7.5 x 10-6 rads
2. 5.7 x 10-6 rads
3. 3.6 x 10-6 rads
4. 2.5 x 10-7 rads

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45
A 1.7 m tall woman stands 5 m in front of a
camera with a 5 cm focal length lens. What is the
size of the image formed on film?

1. 3.4 cm
2. 2.6 cm
3. 1.7 cm
4. 0.85 cm

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46
A nearsighted person cannot see objects clearly
beyond 30 cm (the farpoint). If the patient has
no astigmatism and contact lenses are prescribed,
what is the power of the lens required to correct
the patient's vision?

1. -2.0 diopters
2. -3.3 diopters
3. -4.0 diopters
4. -5.0 diopters

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47
The pupil of a cat's eye narrows to a slit of 0.5
mm in daylight. What is the angular resolution?
(let ? 500 nm).

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

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48
A compound microscope has an eyepiece that?

1. uses a real image from the objective as the
   object and forms its own real image.
2. uses a real image from the objective as the
   object and forms a virtual image.
3. uses an imaginary image from the objective as the
   object and forms its own real image.
4. uses an imaginary image from the objective as the
   object and forms its own imaginary image.

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49
A camera lens is initially set at f/16 for a
shutter speed of 0.016 s. If the amount of
lighting on the subject is unchanged and the lens
is set at f/5.6, what is the proper shutter speed
at this setting?

1. 0.002 s
2. 0.004 s
3. 0.128 s
4. 0.064 s

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50
A converging lens will be prescribed by the eye
doctor to correct which of the following?

1. nearsightedness
2. glaucoma
3. farsightedness
4. astigmatism

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51
When the image formed by a simple magnifier is
made to appear at the near point distance from
the eye of the viewer (25 cm), what is the
magnifying power of a magnifier with a focal
length of 5.0 cm?

1. 1.20
2. 5.00
3. 6.00
4. 50.0

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52
A camera lens with a focal length of 2 cm and an
aperture opening diameter of 0.4 cm has what
f-number?

1. 0.2
2. 0.8
3. 5.0
4. 10.0

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53
What is the approximate magnification of a
compound microscope with objective and eyepiece
focal lengths of 0.3 cm and 3.6 cm, respectively,
and a separation between lenses of 20 cm?

1. 12
2. 20
3. 67
4. 460

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54
What is the magnification of a refracting
telescope with objective and eyepiece lenses of
focal lengths 90 cm and 2.0 cm, respectively?

1. 30
2. 45
3. 60
4. 180

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55
If a person has hyperopia that person?

1. may have an unusually long eyeball.
2. cannot see near objects clearly.
3. cannot relax the ciliary muscle adequately.
4. can form images behind the retina.

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56
A nearsighted person with astigmatism would be
prescribed a lens that is?

1. converging only.
2. both converging and cylindrical.
3. diverging only.
4. both diverging and cylindrical.

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57
Glaucoma occurs because?

1. the eye cannot accommodate properly.
2. the shape or size of the eye is not normal.
3. there is too much pressure in the fluid in the
   eyeball.
4. the lens is partially or totally opaque.

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58
In the normal eye the ciliary muscles that
control the lens will relax?

1. when viewing objects at the nearpoint.
2. when viewing objects at infinity.
3. when viewing objects at a distance of 20 ft.
4. only when a person has his/her eyes closed.

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59
A magnifier uses a?

1. converging lens to form a real image.
2. converging lens to form a virtual image.
3. diverging lens to form a virtual image.
4. diverging lens to form a real image.

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