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Physics II - Test 4
Terms in this set (81)
The blackness of the type on a page is due to
When sunlight illuminates a page from your Conceptual Physics book it
reflects most of it.
absorbs at the text lettering.
Cite the law of reflection.
The angle of incidence equals the angle of reflection.
When light reflects from a surface, there is a change in its
none of the above
Specular reflection is common in the light reflected from
Diffuse reflection occurs when the size of surface irregularities is
large compared to the wavelength of the light used.
Does the law of reflection hold for curved mirrors? Explain.
Yes. It is as if the curved mirror is made of many small plane mirrors at slightly different orientations to each other.
What fraction of the light shining straight at a piece of clear glass is reflected from the first surface?
The amount of light reflected from the front surface of a common windowpane is about
A yellow candle flame reflects from opposite surfaces of a piece of red glass.
one image is yellow and the other red
In the demonstration portion of the video, you were asked to think about the image of a candle formed by a concave mirror. Suppose that the lower half of the mirror were covered with black tape. How would that affect the image?
The entire image would remain but would become dimmer.
Light rays that leave a single point on the candle reflect from every part of the mirror and then pass through a single point on the image. When part of the mirror is covered, some but not all of those rays are blocked.
(Figure 1) shows a candle placed on the principal axis of a spherical concave mirror with the focal point F. One ray of light is shown leaving the center of the candle flame and reflecting off the mirror. This can be treated as
an incident ray passing through the focal point.
In general, any ray passing through the focal point and then striking a concave mirror will be reflected parallel to the principal axis. In this case, the ray shown does not actually pass through the focal point. However, we can imagine a light ray that does pass through the focal point and continues to the center of the flame. This ray would exactly overlap the ray shown in the diagram and thus would reflect in the same manner.
What type or types of image can be displayed on a screen (for example, on a blank sheet of white paper)?
For an image to be displayed on a screen, the light forming the image must pass through the image location. Real images have this property, whereas virtual images do not.
A small ball is held at a point—A, B, or C—in front of a plane mirror, as shown in (Figure 2) . Rank points A, B, and C according to the distance between the actual ball and the image of the ball, from greatest to smallest.
If any two ball locations produce the same distance between the ball and its image, overlap the location points.
C Greatest Distance
A & B are the same distance.
The inversion of your image in a plane mirror is actually an inversion of
You photograph the image of your little sister, who stands 2 meters in front of a plane mirror. Holding the camera beside her head, the distance to her image is
If you walk towards a mirror at a certain speed, the relative speed between you and your image is
twice your speed.
How does the angle at which a ray of light strikes a pane of window glass compare with the angle at which it passes out the other side?
The angles are the same.
When is the angle at which a ray of light strikes glass not the same as the angle it exits?
When the light strikes the glass in one medium (such as air) and exits the glass into another medium (such as water)
What is the relationship between index of refraction and the speed of light in a material?
The index of refraction is inversely proportional to the speed of light in a material.
When the wheel of a cart rolls from a smooth sidewalk onto a plot of grass, the interaction of the wheel with the blades of grass slows the wheel. What slows light when it passes from air into glass or water?
Light passing through glass or water oscillates electrons which absorb some of the energy and reemit it after a delay at each atom.
What is the angle between a light ray and its wavefront?
A right angle
What is the relationship between the direction of traveling rays of light and the line representing the wave crests?
The direction of the rays of light is perpendicular to the line representing the wave crests.
What happens to the speed of light waves when they enter water from air?
The speed decreases.
What happens to the wavelength and frequency of the light waves as they enter water from air?
Wavelength decreases, and frequency will stay the same.
A magnifying glass widens the angle through which
an object is viewed
Refraction occurs when light passing from one medium to another
Light refracts when traveling from air into glass because of a change in light's
When a light ray in air enters water at 15° from the normal, it
always bends toward the normal.
Light travels slower in a lens having a
high index of refraction.
When a flashlight submerged in water shines up into the air above, does the speed of light increase or decrease when the light passes from water into the air?
Which of the following changes when light is refracted?
Which travels more slowly in glass, red light or violet light? Why?
Violet light travels slower because it is closer in frequency to the ultraviolet resonance of the atoms in the glass.
Does a single raindrop illuminated by sunlight deflect light of a single color or does it disperse a spectrum of colors? Does it do this by reflection, refraction, or both?
It disperses a spectrum of colors, by both reflection and refraction.
Does a viewer see a single color or a spectrum of colors coming from a single faraway drop?
A viewer sees a single color from a single faraway drop.
When white light strikes a prism, what happens and why?
The white light emerges with the colors separated, with the red light bending the least.
Why does a rainbow look like a curve when viewed from the ground?
Raindrops act like prisms that reflect the colors of light in particular angles depending on how the individual colors are bent by the prism. Light seen at that angle forms a bow shape.
What would the rainbow look like to a viewer in the sky, and why?
The rainbow would appear to be a complete circle, because Earth no longer obstructs our view when we are above.
Dispersion of light from drops making up a rainbow have undergone refraction and internal
A secondary rainbow in the sky is the result of a
a double reflection in drops
Light of different colors in a vacuum travel at
the same speed.
Light of different colors in a glass prism travel at
When sunlight from air enters water, light that refracts most is
A single raindrop illuminated by sunshine disperses
all the colors of the rainbow.
Rainbows are not usually seen as complete circles because
the ground is usually in the way.
When a rainbow is seen as a complete circle from an airplane, the airplane's shadow is
in the center of the rainbow.
A primary rainbow is brighter than a secondary rainbow because
there is one less reflection inside the water drops.
Chromatic aberration is a consequence of different colors in a lens having different
Identical rays of light in air are refracted upon entering three transparent materials:
A, water, where the speed of light is 0.75c;
B, ethyl alcohol (speed 0.7c);
C, crown glass (speed 0.6c).
C, B, A
For viewing tiny objects in a microscope, diffraction is
A thin film appears yellow when illuminated with white light. The color being cancelled by destructive interference is
A thin film appears cyan when illuminated with white light. The color being cancelled by destructive interference is
What can exist in the same place at the same time?
Which will produce more widely spaced fringes of light when passed through a diffraction grating - light from a red laser or light from a green laser?
light from a red laser
What accounts for the different colors in a soap bubble?
Light reflecting from the outer and inner surfaces of the bubble travels different distances.
Superposition of waves can produce
A diffraction grating separates light into its component colors by the process of
Is diffraction more pronounced through a small opening or through a large opening?
Diffraction is more pronounced through a small opening, where small is compared to a wavelength.
Diffraction is most closely related to
A glass prism separates light into its component colors by the process of
A double-slit arrangement produces interference fringes for yellow sodium light. To produce narrower-spaced fringes, should red light or blue light be used?
Waves spread when passing through openings of various sizes. More spreading occurs for openings that are
When you view color in a soap film with sunlight in back of you, a friend on the other side of the soap film likely sees
a different color.
What aspect of light did Thomas Young demonstrate in his now-famous light experiment?
The principle of superposition known as interference
The superposition of identical waves affects
A thin film appears magenta when illuminated with white light. The color being cancelled by destructive interference is
If the path-length difference between two identical and coherent beams is two wavelengths when they arrive on a screen, will they produce a dark or a bright spot?
For an opening of a given size, is diffraction more pronounced for a longer wavelength or for a shorter wavelength?
Will plane waves incident upon a small opening in a barrier fan out on the other side or continue as plane waves?
They will fan out and decrease in amplitude.
Which will give wider-spaced fringes in a double-slit experiment, red light or violet light?
the CHANGE OF DIRECTION of a ray of light, when the light BOUNCES OFF A SURFACE.
The normal line is
an imaginary reference line drawn perpendicular to the surface at the place where the light hits it.
The law of reflection is
the angle of incidence is equal to the angle of reflection.
the CHANGE IN DIRECTION of a ray of light, when the light CHANGES SPEED, as the light TRAVELS from one material into another.
the SPREADING OF A WAVE when you INTERRUPT IT'S WAVEFRONT, MORE OR LESS.
Wave model of light
light is an influence with crests and troughs.
Ray model of light
light travels in straight lines.
helpful. in step, in phase, crest and crest, trough and trough, louder, brighter, stronger.
hurtful. out of step, out of phase, weaker, crests and troughs.
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