Reflection and Mirrors

The diagram below shows a light ray from a pencil hitting a mirror. Which ray shows the correct direction of the reflected ray? 1 2 3 4

2

The diagram below shows a paper clip in front of a mirror. Where will the image of the paper clip appear to the observer? 1 2 3 4

3

The diagram shows the reflection of light from a mirror. The value of x in the diagram is °.

50

Which type of surface is best able to reflect light? A rough, cloudy surface. A rough, polished surface. A smooth, polished surface. A smooth, cloudy surface.

A smooth, polished surface.

Sayid listed some characteristics of waves in a chart. Part of his chart is shown. Which of these would correct Sayid's error? Change the heading of the chart to "Mechanical." Replace "travel in straight lines" with "move in curved paths." Add "move due to particles bumping into each other" to the chart. Change "move only through matter" to "move through space and matter."

Change "move only through matter" to "move through space and matter."

Different kinds of lenses are used in eyeglasses to help people with eye conditions. Farsightedness is an eye condition in which distant objects appear clear but close objects appear blurry. Nearsightedness is an eye condition in which close objects appear clear but distant objects appear blurry. Which best describes the type of lens that would help someone with one of these eye conditions? Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer. Concave lenses would help someone who is farsighted because the lenses make objects look smaller and closer. Convex lenses would help someone who is nearsighted because the lenses can make objects look smaller and closer. Convex lenses would help someone who is nearsighted because the lenses can make objects look larger and farther away.

Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer.

The picture shows rays passing through an unknown lens. Which ray would appear on a ray diagram for both a concave lens and a convex lens? A B C D

D

Which must be included when drawing ray diagrams? Check all that apply. focal point lens focal length three easy rays axis

Focal point lens three easy rays axis

Why does green light slow down more than orange light does when passing through an object? Green light has longer wavelengths than orange light. Green light has fewer particles than orange light. Green light refracts less than orange light. Green light has a higher frequency than orange light.

Green light has a higher frequency than orange light.

How does a convex mirror form an image? It bends the light toward a focal point. It bends the light away from a focal point. It bounces the light toward a focal point. It bounces the light away from a focal point.

It bounces the light away from a focal point.

How does a concave mirror form an image? It bends the light toward a focal point. It bends the light away from a focal point. It bounces the light toward a focal point. It bounces the light away from a focal point.

It bounces the light toward a focal point.

Olaf takes a picture of his dog using a digital camera. Which is true regarding the image of the dog detected by sensors in the camera? It forms where light rays coming from the dog converge. It can only be seen from the same side of the lens as the dog. It forms where light rays coming from the camera spread apart. It can only be seen when the camera lens is very close to the dog.

It forms where light rays coming from the dog converge.

Samantha is viewing a real image formed by a lens of a diamond ring. Which must be true about the image? It could not be captured on film. It is larger than the actual ring. It was formed by a concave lens. It is upside down.

It is upside down.

Which best describes what happens when light traveling through air enters water at an angle? It moves along straight lines in air and changes direction when it enters water. It moves in a curve in air and moves in straight lines when it enters water. It moves along straight lines in air and continues along the same lines when it enters water. It moves in a curve in air and continues moving in the same curve when it enters water.

It moves along straight lines in air and changes direction when it enters water.

When all else remains the same, what effect would decreasing the focal length have on a convex lens? It would cause the lens to produce only real images. It would cause the lens to produce only virtual images. It would make the lens stronger. It would make the lens weaker.

It would make the lens stronger.

Which example best illustrates that light behaves like particles? Light bends as it strikes a window. Light bounces off a white cement sidewalk. Light travels in space at a speed of about 3.0 x 108 m/s. Light increases in speed as it moves through matter.

Light bounces off a white cement sidewalk.

How is an image formed by a plane mirror? Light bounces off of the mirror and then appears to come from in front of the mirror. Light passes through the mirror and then appears to come from behind the mirror. Light passes through the mirror and then appears to come from in front of the mirror. Light bounces off of the mirror and then appears to come from behind the mirror.

Light bounces off of the mirror and then appears to come from behind the mirror.

Zaccharias Janssen was a scientist who studied properties of light and invented one of the first compound microscopes in the late 1500s. Which property did Janssen most likelybelieve about light during the time of his invention? Light bends around objects. Light bounces off surfaces. Light travels in a curved path. Light is made up of waves.

Light bounces off surfaces.

Cleo stated that light travels through air in straight paths, and when it moves from air to water, light changes direction, speeds up, and bends toward the normal. Which statement best describes Cleo's mistake? Light travels through air and water in angled, scattered paths. Light does not change direction when it moves from air into water. Light slows down when it moves from air into water. Light bends away from the normal when it moves from air into water.

Light slows down when it moves from air into water.

Which statement best explains a difference between the interaction of light with clear glass and the interaction of light with silver metal? Light slows down when it interacts with glass but not when it interacts with metal. Light slows down when it interacts with metal but not when it interacts with glass. Most of the light passes through glass but none of the light passes through metal. Most of the light is absorbed by glass but none of the light is absorbed by metal.

Most of the light passes through glass but none of the light passes through metal.

Akio draws the ray diagram shown. Which best explains how to correct Akio's mistake? Change the lens so it appears convex instead of concave. Move the small car so it appears on the left side of the lens. Make the small car much larger than the other car. Draw the top ray so that it passes through the focal point on the right.

Move the small car so it appears on the left side of the lens.

Danny drew a ray diagram to show the image of a plastic bottle produced by a concave lens. Which describes how the bottle should appear in the diagram? The image of the bottle should appear larger than the actual bottle. The image of the bottle should be upside down compared to the actual bottle. The actual bottle should appear larger than the image of the bottle. The actual bottle should be upside down compared to the image of the bottle.

The actual bottle should appear larger than the image of the bottle.

Which describes an image that a concave mirror can make? The image is always virtual. The image can be either virtual or real. The image is never upside down. The image can only be the same size as the object.

The image can be either virtual or real.

Which describes an image that a plane mirror can make? The image is always real. The image can be either virtual or real. The image is never right-side up. The image can only be the same size as the object.

The image can only be the same size as the object.

Which describes an image that can be produced by a concave lens? The image is real and smaller than the object. The image is virtual and larger than the object. The image is virtual and smaller than the object. The image is real and larger than the object.

The image is virtual and smaller than the object.

What happens when light from the Sun passes through any type of matter? The light slows down. The light speeds up. Most of the light is absorbed. Most of the light is reflected.

The light slows down.

The diagram below illustrates the law of reflection. According to the law of reflection, which statement must be true? The measure of angle A equals the measure of angle B. The measure of angle B equals the measure of angle C. The measure of angle A equals the measure of angle C. The measure of angle B equals the measure of angle D.

The measure of angle B equals the measure of angle C.

Carla did an experiment by placing a piece of smooth, clear glass and a piece of smooth, black stone under a lamp for twenty minutes. Which prediction will most likely be supported by Carla's experimental results? The glass will feel warmer than the stone after twenty minutes. The stone will feel warmer than the glass after twenty minutes. The glass will reflect all of the light after twenty minutes. The stone will reflect all of the light after twenty minutes.

The stone will feel warmer than the glass after twenty minutes.

The diagram shows an image produced by a lens. At which point does the image appear? W X Y Z

X

Where do the three rays in a ray diagram start? at a focal point on the opposite side of the lens at three different points on the object at a focal point on the same side of the lens at a single point on the object

at a single point on the object

A virtual image seems to come from behind the mirror. the surface of the mirror. in front of the mirror.

behind the mirror.

Use the drop-down menus to answer the questions. Which type of mirror curves outward? Which type of mirror always has an image that is smaller than the object? Which type of mirror is used to focus light rays? Which type of mirror has a flat surface? Plane

convex convex concave

When parallel light rays exit a concave lens, the light rays .

diverge

Which building material would provide the best surface for viewing a reflection? cement brick glass wood

glass

Green plants need light in order to survive. Structures in the leaves absorb light, which in turn, helps plants make their own food. Under which color of light will plants be least likely to make food? red blue orange green

green

Which color of white light bends the most when it is refracted by a prism? red green yellow orange

green

Complete the sentence. According to the law of reflection, the angle of is equal to the angle of reflection.

incidence

Isaac Newton believed that light was made of .

particles

The image produced by a concave mirror is a image.

real

According to the law of reflection, the angle of incidence is equal to the angle of .

reflection

You can use the curved part of a spoon as a mirror because it light.

reflects

When light bends around an object, the light is .

refracted

Lisa sees the image below as she researches the behavior of light. Which behavior is the spoon in the top image most likely being used to illustrate? refraction absorption reflection bounce

refraction

Lin Yao looks at the back of a spoon. How should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

right-side up and smaller

The image of the lemon is at point I. What is the size of the image compared to the size of the lemon?

same size

Which are uses of convex mirrors? Check all that apply. magnifying mirrors for putting on makeup side-view mirrors on vehicles hallway safety mirrors focusing automobile headlights lenses in sunglasses

side-view mirrors on vehicles hallway safety mirrors lenses in sunglasses

Which describes the image produced by a convex mirror? smaller than the object and right-side up smaller than the object and upside down same size as the object and right-side up

smaller than the object and right-side up

A light ray hits a hard, opaque object. The angle at which the light ray bounces off the object depends on the smoothness of the surface. the material the surface is made of. the angle at which the light hits the surface. the source of the light that hits the surface.

the angle at which the light hits the surface.

Which of these diagrams is a convex mirror?

the first one

A(n) image cannot be projected and forms where light rays appear to originate.

virtual

Franny drew a diagram to compare images produced by concave and convex lenses. Which belongs in the area marked X? Real Virtual Larger than object Upside down

virtual

Which describe the image formed by a plane mirror? Check all that apply. virtual real upside down right-side up larger than the object smaller than the object same size as the object

virtual right-side up same size as the object

Which describe the image formed by a convex mirror? Check all that apply. virtual real upside down right-side up larger than the object smaller than the object same size as the object

virtual right-side up smaller than the object

According to Dutch scientist Christiaan Huygens, what was light made of? atoms particles waves electrons

waves

Prisms separate light, such as that from the Sun, by wavelength.

white

What type of mirror is being used in the image?

concave

Which type of mirror can create a real image?

concave

Harry is reading an online summary of the law of reflection. The site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror. Which statement corrects an error on the site? The normal is a line perpendicular to the surface of the mirror. The normal is a line perpendicular to the incoming ray. The angle of reflection is the angle between the incoming ray and the normal. The angle of reflection is the angle between the reflected ray and the incoming ray.

The normal is a line perpendicular to the surface of the mirror.

Roshan makes the table below to describe how to draw a ray diagram for a convex lens. What error did Roshan make? The ray that goes through the center should bend and go through the focal point on the other side. The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side. The ray that goes parallel to the main axis after passing through the lens should also be parallel from the object to the lens. The rays in the table describe how rays are drawn for a concave lens rather than for a convex lens.

The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side.

Xander drew a diagram of a candle and its reflection in a mirror as shown below. How should Xander describe the reflection? The reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle. The reflection of the candle in the convex mirror formed an upside-down real image that is smaller than the candle. The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle. The reflection of the candle in the convex mirror formed an upside-down virtual image that is smaller than the candle.

The reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle.

Which statement correctly compares the speed of light? The speed of light through space is much greater than 3 x 108 m/s. The speed of light in glass is much greater than 3 x 108 m/s. The speed of light in glass is faster than the speed of light through space. The speed of light in glass is slower than the speed of light through space.

The speed of light in glass is slower than the speed of light through space.

Glare appears on a computer screen when light from the surroundings reflects off of the screen's surface. Some computer screens have a special coating to reduce glare. Which best explains how the coating works? The coating absorbs light that shines on it and prevents the light from reflecting. The surface of the coating is rough, so light that shines on it gets scattered in many directions. The coating bends light that passes through it and prevents the light from reaching the user's eyes. The surface of the coating allows light from the room to pass through but blocks the light from the screen.

The surface of the coating is rough, so light that shines on it gets scattered in many directions.

The diagram shows a clear plastic lens. A student shines a flashlight on the lens. Which best describes what happens when light rays exit the lens? They are all refracted away from a central axis. They are all refracted toward a central axis. They exit parallel to the path in which they entered. They exit at a slower speed from which they entered.

They are all refracted toward a central axis.

After the 1600s, how did observations of light being refracted change the way most scientists thought about light? They no longer believed that light acted as waves. They began to believe that light acted as waves. They no longer believed that light acted as particles. They began to believe that light acted as particles.

They began to believe that light acted as waves.

Juan created a chart to help him study for a test. Which headings best complete the chart? X: Transparent Objects Y: Opaque Objects X: Opaque Objects Y: Transparent Objects X: High Frequency Waves Y: Low Frequency Waves X: Low Frequency Waves Y: High Frequency Waves

X: Opaque Objects Y: Transparent Objects

The chart shows the densities of four substances. Which list shows the order in which white light passes through these substances, from fastest to slowest? Z, Y, X, W W, X, Y, Z W, X, Z, Y Y, X, Z, W

Y, X, Z, W

Which object absorbs the most visible light? a clear bowl a white rock a black t-shirt a red apple

a black t-shirt

Which of these will reflect light with the highest frequency? an orange basketball a blue candle a green ribbon a yellow banana

a blue candle

Which object is least likely to allow light to pass through it? a pair of eyeglasses a clear water bottle a car windshield a tree trunk

a tree trunk

The diagram shows light interacting with an object. Which object is the light most likely striking? a window a mirror a plaster wall a steel beam

a window