Chapter 28: Reflection and Refraction Flashcards
Light will almost always travel from one place to another along a path of least: a) distance; b) time; c) effort; d) expense; e) complication.
b) time.
The amount of light reflected from the front surface of a common windowpane is about: a) 4 percent; b) 8 percent; c) 40 percent; d) 92 percent; e) 96 percent.
a) 4 percent.
The shortest plane mirror in which you can see your entire image is
half your height.
A mirage is a result of atmospheric
refraction.
The average speed of light is greatest in: a) red glass; b) orange glass; c) green glass; d) blue glass; e) is the same in all of these.
a) red glass.
The Law of Reflection says that: a) changes in latitude equal changes in attitude; b) the angle of incidence equals the angle of reflection; c) the speed of light in a vacuum x n = the speed of light in the material; d) the distance to the object equals the distance to the virtual image; e) the actual light path equals the apparent light path.
b) the angle of incidence equals the angle of reflection.
A single raindrop illuminated by sunshine disperses: a) a single color; b) either low, middle, or high-frequency colors in most cases; c) all the colors of the rainbow.
c) all the colors of the rainbow.
Diffuse reflection occurs when the size of surface irregularities is: a) small compared to the wavelength of the light used; b) large compared to the wavelength of the light used; c) microscopic.
b) large compared to the wavelength of the light used.
If you walk towards a mirror at a certain speed, the relative speed between you and your image is: a) half your speed; b) your speed; c) twice your speed; d) none of these.
c) twice your speed.
Light travels fastest in
a vacuum.
Different colors are dispersed by a prism because different colors in the prism have different: a) frequencies; b) speeds; c) directions; d) energies.
b) speeds.
Refraction causes the bottom of a swimming pool to appear: a) farther down than it actually is; b) closer to the surface than it actually is; c) neither.
b) closer to the surface than it actually is.
As a light ray enters and exits a water-air interface, it: a) always bends toward the normal; b) always bends away from the normal; c) sometimes bends towards the normal, sometimes bends away; d) does not bend.
c) sometimes bends towards the normal, sometimes bends away.
When light reflects from a surface, there is a change in its: a) frequency; b) wavelength; c) speed; d) all of these; e) none of these
e) none of these
Object and image for a plane mirror lie: a) along the same plane; b) equal distances from the mirror; c) at right angles to each other. d) all of these; e) none of these.
b) equal distances from the mirror.
Your vision is sharpest when your pupil is: a) dilated; b) constricted; c) same either way.
b) constricted.
Light takes the ________ path in going from one place to another.
quickest;
Fermat’s principle of least time.
We say light is _________ when it is returned into the medium from which it came.
reflected;
The process is reflection.
The angle of reflection equals the angle of
incidence.
The law of reflection applies to: a) light; b) sound; c) Both a. and b.; d) None of the above.
c) Both a. and b.
_______ _____ is same size as object, formed behind a mirror, and located at the position where the extended reflected rays converge.
Blank 1: Virtual
Blank 2: image
Virtual image is as far behind the mirror as the object is in front of the mirror.
In a _____ ______ the only axis reversed in an image is the front-back axis.
Blank 1: plane
Blank 2: mirror
Real world: Right-handed coordinate system
Mirror Image world: Left-handed coordinate system
______ mirror the virtual image is smaller and closer to the mirror than the object.
Convex; (curves outward)
_______ mirror the virtual image is larger and farther away than the object.
Concave; (curves inward)
Light reflecting from a smooth surface undergoes a change in: a) frequency; b) speed; c) wavelength; d) None of the above.
d) None of the above.
Bending of light when it passes from one medium to another?
Refraction;
Caused by change in speed of light.
When light travels from one medium to another and changes speed in doing so, we call the process: a) reflection; b) interference; c) dispersion; d) refraction.
d) refraction.
The principle of least time?
Refraction
Light travels ______ in glass than in air.
slower; thus it minimizes the time it spends in the glass (refraction). Light follows a less inclined path in the glass.
Pathways are __________ for both reflection and refraction.
reversible
Refracted light that bends TOWARD the normal is light that has: a) slowed down; b) sped up; c) nearly been absorbed; d) diffracted.
a) slowed down.
Refracted light that bends AWAY from the normal is light that has: a) slowed down; b) sped up; c) nearly been absorbed; d) diffracted.
b) sped up.
Index of refraction (n) indicates how much the speed of _____ differs from its speed in a ______.
Blank 1: light
Blank 2: vacuum.
Indicates the extent of bending of rays. The ratio of speed of light in a vacuum to the speed in a material.
A medium with a high index means high _______ effect and greatest slowing of _____.
Blank 1: bending
Blank 2: light
Index of refraction
Objects such as the Sun seen through air are _________ because of atmospheric _________.
Blank 1: displaced
Blank 2: refraction
Light travels ______ in hot air.
faster
The action of lenses depends mainly on: a) reflection; b) refraction; c) Both a. and b.; c) Neither a. nor b.
b) refraction.
A convex lens is thicker at the center than edges
and _________ light.
converges.
A converging lens can project an image.
A concave lens is thinner at the center than edges and ________ light.
diverges
All are key features of ______:
Principal axis: line joining the centers of curvature of the two lens surfaces; Focal point: point at which all the light rays come together; Focal length: distance between the center of the lens and either focal point.
lenses
