Download Chapter 23 Study Questions

Chapter 23 Study Questions Name: __________________________ Class: _____________
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. When you look at yourself in a plane mirror, you see a
a. real image behind the mirror.
b. real image on the surface of the mirror.
c. virtual image that appears to be behind the mirror.
d. virtual image that appears to be in front of the mirror.
2. A vision problem that occurs when light is focused in front of the retina is
a. nearsightedness.
c. color deficiency.
b. farsightedness.
d. None of the above
3. Which part of the eye refracts light?
a. iris
c. lens
b. cornea
d. Both (b) and (c)
4. Visible light produced when electrons combine with gaseous metal atoms is
a. incandescent light.
c. neon light.
b. fluorescent light.
d. vapor light.
5. You see less of a glare when you wear certain sunglasses because the lenses
a. produce total internal reflection.
c. produce coherent light.
b. create holograms.
d. polarize light.
6. What kind of mirrors provide images of large areas and are used for security?
a. plane mirrors
c. convex mirrors
b. concave mirrors
d. All of the above
7. A simple refracting telescope has
a. a convex lens and a concave lens.
c. two convex lenses.
b. a concave mirror and a convex lens.
d. two concave lenses.
8. Light waves in a laser beam interact and act as one wave. This light is called
a. red.
c. coherent.
b. white.
d. emitted.
9. The aperture of a camera works most like the ____ of the eye.
a. lens
c. pupil
b. iris
d. cornea
10. To represent the ____ of a mirror, you would draw a line outward from its center.
a. real image
c. curvature
b. focal point
d. optical axis
11. Polarizing filters produce light waves that
a. have a single color.
c. vibrate at a low frequency.
b. vibrate in only one plane.
d. possess tremendous energy.
12. Which of the following statements about laser light is NOT correct?
a. It is intense.
b. It is white light that contains all colors.
c. It is produced by stimulated photon emission.
d. It consists of light waves whose crests and troughs are aligned.
13. The production of both fluorescent light and neon light involve
a. intense heating of sodium gas.
b. vaporization of a tungsten filament.
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c. formation of new chemical compounds.
d. collisions between electrons and gas particles.
Which of the following is a true statement about the lens of the eye?
a. It forms a virtual image.
b. It is thinner in its middle than at its edge.
c. It functions like a convex mirror to reflect light onto the retina.
d. It changes thickness to focus on objects at various distances.
A convex mirror and a concave lens both cause light rays to
a. slow down.
c. gain energy.
b. spread apart.
d. form blurry images.
Which of the following statements about holograms is NOT true?
a. A hologram is produced by a laser.
b. A hologram shows a three-dimensional image of an object.
c. A hologram’s image is recorded on the surface of film.
d. Holograms are produced by a laser split into two beams.
Scientists describe objects that produce visible light as being
a. illuminated.
c. luminous.
b. incandescent.
d. opaque.
Scientists describe a visible object that is NOT a light source as being
a. illuminated.
c. incandescent.
b. luminous.
d. opaque.
Light can be produced
a. by heating a piece of metal.
b. by sending an electric current through gases.
c. chemically.
d. All of the above
Light that is produced by hot objects is called
a. neon light.
c. vapor light.
b. incandescent light.
d. fluorescent light.
____ is visible light emitted by a phosphor particle when it absorbs energy.
a. Vapor light
c. Neon light
b. Incandescent light
d. Fluorescent light
____ is produced when electrons combine with gaseous metal atoms.
a. Vapor light
c. Neon light
b. Ultraviolet light
d. Fluorescent light
____ is visible light emitted by atoms of certain gases when they absorb and then release energy.
a. Fluorescent light
c. Neon light
b. Vapor light
d. Incandescent light
A ____ is a mirror with a flat surface.
a. concave mirror
c. plane mirror
b. convex mirror
d. focal mirror
When you look in a plane mirror, your reflection is
a. upside-down and the same size as you are.
b. upright and the same size as you are.
c. upright and smaller than you are.
d. upright and larger than you are.
The image formed by a plane mirror is a(n)
a. virtual image.
c. inverted image.
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b. real image.
d. diffracted image.
Mirrors are classified by their
a. mass.
c. density.
b. shape.
d. index of refraction.
Mirrors that are curved inward, such as the inside of a spoon, are
a. real mirrors.
c. concave mirrors.
b. plane mirrors.
d. convex mirrors.
Mirrors that are curved outward, such as the back of a spoon, are
a. real mirrors.
c. concave mirrors.
b. plane mirrors.
d. convex mirrors.
Light beams entering a mirror parallel to the optical axis are reflected through the
a. focal length.
c. virtual image.
b. focal point.
d. real axis.
The distance between a mirror's surface and the focal point is called the
a. optical length.
c. virtual distance.
b. real distance.
d. focal length.
Below are diagrams of triangular wooden blocks in front of three different mirrors. Examine the diagrams
below and answer the questions that follow.
____ 32. Which mirror is concave?
a. A
b. B
____ 33. Which mirror is convex?
a. A
b. B
c. C
d. None of the above
c. C
d. None of the above
____ 34. Which mirror is a plane mirror?
a. A
c. C
b. B
d. None of the above
____ 35. The dotted line indicates the
a. focal point.
c. optical point.
b. focal length.
d. optical axis.
____ 36. Mirror A will form a
a. virtual image behind the mirror.
c. real image behind the mirror.
b. virtual image in front of the mirror.
d. real image in front of the mirror.
____ 37. Mirror B can form a
a. virtual image behind the mirror.
c. real image in front of the mirror.
b. virtual image in front of the mirror.
d. Both (a) and (c)
____ 38. Mirror C will form a
a. real image behind the mirror.
c. real image in front of the mirror.
b. virtual image behind the mirror.
d. Both (b) and (c)
____ 39. An object less than one focal length away from a concave mirror forms a(n)
a. upright virtual image.
c. upright real image.
b. upside-down virtual image.
d. upside-down real image.
____ 40. A ____ is thicker in the middle than at the edges.
a. convex lens
c. focal lens
b. concave lens
d. plane lens
____ 41. A ____ is thinner in the middle than at the edges.
a. convex lens
c. focal lens
b. concave lens
d. plane lens
The following questions refer to the human eye.
____ 42. After passing through the cornea, light passes through the
a. retina.
c. lens.
b. pupil.
d. iris.
____ 43. The size of the pupil is controlled by the
a. retina.
c. iris.
b. lens.
d. cornea.
____ 44. The back surface of the eye is called the
a. retina.
c. lens.
b. iris.
d. cornea.
____ 45. The lens of the eye is
a. concave.
c. planar.
b. convex.
d. conjunctive.
____ 46. A ____ image is formed on the retina.
a. horizontal
c. real
b. vertical
d. virtual
____ 47. Receptors in the retina are called
a. squares and rods.
c. squares and ovals.
b. ovals and cones.
d. rods and cones.
____ 48. The ____ enables the lens in a human eye to focus.
a. cornea
c. iris
b. pupil
d. muscles around the lens
____ 49. A ____ is used to correct nearsightedness.
a. concave lens
c. bifocal lens
b. convex lens
d. trifocal lens
____ 50. A ____ is used to correct farsightedness.
a. concave lens
c. bifocal lens
b. convex lens
d. trifocal lens
____ 51. Farsightedness occurs when the eye is too
a. long and the lens focuses light in front of the retina.
b. long and the lens focuses light behind the retina.
c. short and the lens focuses light in front of the retina.
d. short and the lens focuses light behind the retina.
____ 52. True colorblindness is when a person can see
a. only shades of red.
c. only in black in white.
b. only shades of green.
d. in all colors except black and white.
____ 53. Most people with color deficiency, often referred to as colorblindness, cannot distinguish between shades of
a. red and white.
c. blue and green.
b. red and yellow.
d. red and green.
____ 54. There are ____ types of cones, which are named for the colors they detect most.
a. two
c. four
b. three
d. five
____ 55. Cones detect the colors ____ the most.
a. red and green
c. red, blue, and green
b. red and blue
d. red, blue, and yellow
____ 56. The ____ of a camera focuses light on the film.
a. convex lens
c. shutter
b. concave lens
d. aperture
____ 57. The ____ is an opening in the lens that lets light into a camera.
a. shutter
c. lens
b. aperture
d. film
____ 58. The ____ opens and closes behind the lens to control how much light enters a camera.
a. convex lens
c. shutter
b. concave lens
d. aperture
____ 59. The larger the aperture is, the
a. less light enters the camera.
c. better the focus of the lens.
b. more light enters the camera.
d. Both (b) and (c)
____ 60. The longer the shutter is open, the
a. more light enters the camera.
c. better the focus of the lens.
b. less light enters the camera.
d. Both (b) and (c)
____ 61. A reflecting telescope uses
a. a concave mirror.
c. a plane mirror.
b. a convex lens.
d. All of the above
____ 62. A simple light microscope uses
a. a laser.
c. a convex and a concave lens.
b. two convex lenses.
d. a concave mirror and a convex lens.
____ 63. Laser light
a. does not spread out very much over long distances.
b. is tightly focused.
c. is coherent.
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d. All of the above
Non-laser light is different from laser light in that non-laser light
a. contains light waves of only one wavelength and color.
b. spreads out greatly over long distances.
c. is produced by stimulated emission.
d. is brighter than laser light.
The word laser stands for
a. light amplification by simple emission of radiation.
b. light amplification by stimulated emission of radiation.
c. light aggregation by stimulated exchange of radiation.
d. light amplification by simple exchange of radiation.
Holograms are formed through ____ of light.
a. interference
c. refraction
b. diffraction
d. reflection
Optical fibers transmit light over long distances by
a. partial internal reflection.
c. constructive interference.
b. total internal reflection.
d. destructive interference.
You can use ____ to reduce the amount of reflected light that enters your camera.
a. a shutter
c. a polarizing filter
b. an aperture
d. polarizing lenses
____ have long molecules that line up like parallel slits, allowing only waves vibrating in the same direction
as the slits pass through.
a. Light waves
c. Color filters
b. Polarizing filters
d. Optical fibers
What happens when you place two polarizing filters at right angles to one another?
a. Light waves travel in all directions again.
b. Light waves are reflected back to the source.
c. Light waves pass through unchanged.
d. No light passes through.
Lasers are used to
a. cut through tissue.
b. correct nearsightedness and farsightedness.
c. produce holograms.
d. All of the above
An object that is located more than one focal length away from a concave mirror forms an
a. upright real image.
c. upside-down virtual image.
b. upright virtual image.
d. upside-down real image.
Halogen lights are
a. incandescent lights.
c. neon lights.
b. fluorescent lights.
d. vapor lights.
Because the lens of your eye is convex, it forms a ____ image on the retina.
a. virtual, upright
c. virtual, upside-down
b. real, upright
d. real, upside-down
A person's prescription changes if they change from glasses to contact lenses because
a. their eyes get shorter.
c. less light enters their eyes.
b. the lens is closer.
d. All of the above
Short Answer
76. Examine the ray diagrams below, and identify the type of mirror or lens that is being used and the kind of
image that is being formed.
Examine the diagram below, and answer the questions that follow.
77. How would you position polarizing filter B so that light rays could not pass through both filters?
78. What type of light rays would pass through both polarizing filter A and polarizing filter B? Explain your
answer.
79. Below is the beginning of a ray diagram of a light beam reflecting off a mirror. Draw the reflected ray, and
indicate whether the image will be real or virtual.
80. Suppose you place a wooden triangular block in front of a convex mirror. In the picture below, sketch a ray
diagram. Is the image real or virtual? Is it upright or upside-down? Is the image larger, smaller, or the same
size as the wooden block in front of the mirror?