Name: ________________________ Class: ___________________ Date: __________
Exam 3--PHYS 151--S15
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Consider this diagram of the eye and answer the following questions.
Which is the part that changes the focal length of the lens?
a. (1)
d. (4)
b. (2)
e. (5)
c. (3)
2. At this part of the eye, most of the refraction of
light occurs.
a. (2)
b. (3)
c. (4)
d. (6)
5. This limits the amount of light that enters the eye.
a. 2
b. 3
c. 4
d. 6
6. This part is called the fovea.
a. (4)
b. (5)
c. (6)
d. (7)
3. This part carries electrical signals to the brain.
a. (4)
b. (5)
c. (6)
d. (7)
7. There are no rods or cones at this part of the eye. It
is a “blind “spot.”
a. (5)
b. (6)
c. (7)
4. This part of the eye is called the lens
a. 1
b. 2
c. 3
d. 4
1
12. Light moves through a slab of glass. Which is the
path it would take?
8. When light travels from a vacuum to a medium it,
necessarily, does which of these?
a. travels straight
b. slows down
c. bends
d. speeds up
9. What is the proper order of these types of radiation,
in order from smallest to biggest energy?
gamma rays
infrared
microwaves
ultraviolet
a. infrared, microwaves, ultraviolet, gamma rays
b. microwaves, infrared, ultraviolet, gamma rays
c. infrared, ultraviolet, microwaves, gamma rays
d. gamma rays, infrared, microwaves, ultraviolet
a.
b.
c.
13. The focal length is equal to___.
I. ½ the center of curvature
II. The point where parallel rays focus
III. The center of curvature
10. Visible light is caused by which of these?
a. Moving magnetic fields
b. Excessive heating of the atom
c. Electrons moving in and out of energy states of
an atom
d. Visible light is always in existence; it is not
“caused” by anything
a.
b.
c.
d.
e.
III
II & III
I &II
I
II
14. For the eye, when you change the object distance,
you must change the ___ to focus the image.
a. focal length
b. magnification
c. image distance
d. index of refraction
11. Light moves from glass to water as in this figure.
The light _______.
a.
b.
c.
d.
a
b
c
15. An astigmatism causes____.
a. Light to be dimmer than usual
b. The dispersion of light
c. multiple focal points of light
d. The light to focus in front of the retina
e. The light to focus behind the retina
bends towards the normal
bends away from the normal
travels straight
reflects off of the water
16. Hyperopia or far-sightedness is usually caused by
the _______.
a. eyeball being too long
b. eyeball being too short
c. the retina not functioning properly
d. the lens having multiple focal points
2
17. A near-sighted person can see ____.
a. nearby things
b. very bright lights
c. far away things
d. nothing without glasses
24. To correct your vision, the optometrist prescribes
convex lenses with a strength of 2 diopters. At
what point do these lens focus light?
a. 1.5 m
b. 0.5 m
c. 2 m
d. 0.25 m
18. The near point of a typical person is which of
these?
a. 200 cm
b. 0.2 cm
c. 2000 cm
d. 20 cm
25. Concave lenses cause light rays to _____.
a. travel faster
b. diverge
c. converge
d. create a real image
19. As you age, your nearpoint ____.
a. goes away
b. increases
c. decreases
26. Light can be described by which of these
quantities?
I. Frequency
II. Wavelength
III. Amplitude
a. I & II
b. II & III
c. I & III
d. II
e. All of these
20. The focal length of the lens in your eye is equal to
the diameter of the eyeball when the object is
______.
a. nearby
b. far away
c. real
d. virtual
27. Which of these electromagnetic waves has the
highest energy?
a. blue light
b. gamma-rays
c. radio waves
d. ultraviolet light
21. Light entering the eye refracts the most at which
point?
a. the fovea
b. the aqueous humor
c. the lens
d. the cornea
28. As light moves from air to glass, the speed of the
light _______.
a. increases
b. decreases
c. stays the same
22. This liquid in your eye is the same as when you
were born. It is not replenished nor does it drain.
a. aqueous humor
b. vitreous humor
c. CSF
d. fovea
29. When light travels from air to water, the angle of
refraction will be _______ the angle of incidence.
a. greater than
b. less than
c. same as
23. What is the primary purpose of the aqueous
humor?
a. to refract light
b. to help maintain the spherical shape of the
eyeball
c. to limit the amount of light entering the eye
d. to provide nutrients to the eye
3
35. What type of lens is this?
30. A convex lens is shown. Is this a converging or
diverging lens?
a.
b.
c.
converging
diverging
neither
a.
b.
c.
d.
31. Which of these is the sensory layer of the eye?
a. vitreous humor
b. cornea
c. iris
d. retina
36. Which of these colors of light carries the most
energy?
a. green
b. blue
c. red
d. yellow
32. A person diagnosed with nearsightedness or
myopia _______________.
a. cannot see distant objects
b. cannot distinguish colors
c. cannot focus at all
d. cannot see nearby objects
37. The law of refraction describes how light’s _____
varies.
a. speed
b. color
c. amplitude
d. frequency
33. Presbyopia is a condition of farsightedness that
occurs because of ___________.
a. a torn optic nerve.
b. a cloudy cornea
c. an eyeball that is elongated
d. old age
38. Far-sightedness usually occurs because the eyeball
is ____.
a. too short
b. too round
c. too long
d. asymmetrically shaped
34. The following diagram shows a nearsighted eye.
What type of lens is used to correct the person’s
vision?
a.
b.
c.
d.
convex & converging
convex & diverging
concave & converging
concave & diverging
39. At night, which of these parts of the eye is
activated?
a. rods
b. cones
c. the rods and cones always function the same.
40. Electromagnetic radiation is caused by
a. moving charges
b. radioactive elements
c. a constant magnetic field
d. electricity
concave lens
convex lens
This can only be corrected by surgery
There is no hope.
4
ID: A
Exam 3--PHYS 151--S15
Answer Section
MULTIPLE CHOICE
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ID: A
40. ANS: A
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