When a virtual image is created in a plane mirror
the image is upright.
the image is located behind the mirror.
reflected rays diverge.
ALL OF THE ABOVE
NONE OF THE ABOVE
An echo occurs when sound
is transmitted through a surface.
is reflected from a distant surface.
changes speed when it strikes a distant surface.
Diffuse reflection occurs when the size of surface irregularities
larger than 1 m in diameter.
large compared to the wavelength of the light used.
small compared to the wavelength of the light used.
larger than 1 cm in diameter.
It is difficult to see the roadway from a car on a rainy night because the road surface
is obscured by the rain itself.
that is normally a diffuse reflector when dry becomes a mirror surface when wet.
absorbs the light more when wet.
scatters light in all directions.
Refraction is caused by
different wave speeds.
more than one reflection.
displaced images.
bending.
You can hear noises a long distance away over water at night because
of lowered temperature.
water conducts sound better at night.
sound is reflected off water more efficiently at night.
of refraction of sound in air.
The average speed of light is greatest in
orange glass.
blue glass.
red glass.
green glass.
IT IS THE SAME IN ALL OF THE ABOVE
A mirage can occur
when cooler air is above hotter air.
when there's a layer of hot air close to the ground.
on a hot day.
The critical angle for a light from the bottom of a swimming pool shining upward toward the pool's surface is the angle
where light is refracted so it just skims the pool surface.
43 degrees.
at which all light is refracted out of the pool.
42 degrees.
at which some light is reflected from the surface.
A person standing waist-deep in a swimming pool appears to have short legs because of light
refraction.
interference.
diffraction.
reflection.
absorption.
Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at
the same speed.
different speeds.
The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's
transmission qualities.
col.or.
wave nature.
particle nature.
The shortest plane mirror in which you can see your entire image
is half your height.
is twice your height.
is equal to your height.
cannot be determined.
depends on how far the mirror is from you.
A beam of light travels fastest in
air.
water.
plastic.
glass.
ITS AVERAGE SPEED IS THE SAME IN EACH OF THE ABOVE
Which of the following is a consequence of the refraction of light?
rainbows
mirages
internal reflection
Stars twinkle when seen from Earth at night. When seen from the moon, stars
twinkle less.
twinkle more.
don't twinkle.
In a curved optical fiber, light
gains energy in each internal reflection.
internally reflects in a succession of straight-line paths.
bends and follows the curve of the fiber.
scatters in random directions from the fiber's inner surface.
A rainbow nicely illustrates an example of light
internal reflection.
internal reflection and refraction.
neither internally reflecting nor refracting.
In a double rainbow, the outermost color in the outermost bow is
blue.
green.
red.
ANY OF THESE AT DIFFERENT TIMES
A secondary rainbow is dimmer than a primary rainbow because
only large drops produce secondary rainbows.
sunlight reaching it is less intense.
there is an extra reflection inside the water drops.
it is a reflection of the primary rainbow.
When seen from an airplane, a rainbow sometimes forms a complete circle. When this happens, the plane's shadow is
in the center of the rainbow.
totally outside the rainbow.
in the upper part of the rainbow.
nowhere. There is no shadow.
in the lower part of the rainbow.
Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass?
81%
85%
89%
90%
80%
The law of reflection says that all light reaching a boundary between two surfaces is reflected.
When you look at the image of a candle in a plane mirror, you see a real image.
Diffuse reflection occurs when light is reflected in many directions from a rough surface.
Reflection occurs when one pat of a wave travels more slowly than another part.
The critical angle is the angle at which light just grazes the surface of a substance.
Total internal reflection occurs when a light ray hits a surface at an angle greater than the critical angle.
When a wave reaches a boundary between two media, in most cases some of the wave is reflected and some is refracted.
A line that represents the position of a wave crest is called a wave front.