PY 131 Module 23 - Reflection and Refraction

How do mirrors reverse left and right

They don't

What axis is flipped in a mirror

Front-back

You are always looking at things from “behind” in a mirror!

Law of Reflection

The angle of incidence equals the angle of reflection

What size mirror would you need to see your full height

Half your height

Refraction occurs when

A wave guns into a medium into which it travels at a different speed

Light bends into a transparent medium because

Of interactions with that Medium

What cannot occur with light beyond a critical angle

Beyond a critical angle light cannot Escape through the interface into a medium into which it travels faster

A fish looking up to a calm surface sees a distorted..

180° view above water

From the edge of a pond you see a fish. the fish is actually..

Farther from you than it looks to be

Is the critical angle the least in glass water diamond or a vacuum

Diamond

What kind of atmospheric filter effect creates a mirage

Refraction

A hypothetical fish above the surface of water will see better if it has goggles that are

Filled with water

Will parallel rays of red and blue light passing through a convex lens produce images at the same location

No blue light images are closer to the lens

To compensate for refraction when spearing a fish it is best to throw your spear

Below the fish

When a pulse of white light is incident on a pane of glass the first color to emerge is

Red

Refraction causes the bottom of a swimming pool to appear

Closer to the surface than it actually is

What kind of atmospheric filter effect makes stars twinkle

Refraction

You wish to photograph the image of your little sister who is standing 2 m from a plane mirror. Holding the camera beside her head you should set the distance for

4 meters

Mirage occurs for Road surfaces that are

Warm

When photographing nearby objects your camera lens should be moved

Farther than one focal length from the film

The elliptical shape of the Sun at Sunset can be adequately explained by

Both fermats principal and the law of refraction

In quotes spearing unquote a redfish with a red laser beam you should aim your laser

Directly at the fish

How does atmospheric refraction affect daytime

Atmospheric refraction produces longer daytimes

Why are different colors dispersed by a prism

Because different colors in the prism have different speeds

When you view a distant rainbow each single water drop contributes to the bow

A single color

A person who sees more clearly underwater with bare eyes is

Nearsighted

The incident light Ray the reflected light Ray and the normal between them

Lie in the same plane

In spearing a blue fish with a red laser beam you should aim your laser

Below the fish

When does Moonlight appear as a vertical column in the water

When the water is slightly rough

As a monochromatic light passes to and fro in glass and air changes are observed in its

Wavelength and speed

To send a laser beam to a space station that is near the Horizon and above the atmosphere aim your laser

Along your line of sight

When a fish looks Upward at 45° to the water's surface it sees

The sky and possibly some hills

Can a real image or virtual image be projected onto a viewing screen

A real image

Magnification by a lens would be greater if light

Traveled slower in glass than it does

What happens to the speed of a light beam when it goes from water to air

The speed increases

When does diffuse reflection occur

When the size of surface irregularities is large compared to the wavelength of the light used

Objects that are infinitely far away are focused by a converging lens

At the focal point

Where does the image of the sun appear relative to the focal point

At the focal point

What is the result of different speeds of light in transparent materials

Mirages, rainbows, internal reflection

In a vacuum all the different colors of light travel at

The same speed

How does a ray of light Bend when it passes from water to air at a non-90° angle

The light bends away from the normal

Is your image in a plane mirror virtual or real

Virtual

What causes chromatic aberration

Different colors in a lens having different speeds

The critical angle for a transparent material is the angle at (and beyond) which all light within the material is

Reflected

If you walk toward a mirror at a certain speed the relative speed between you and your image is

Twice your speed

Primary Rainbows are brighter than secondary rainbows because

There is one less reflection inside the water drops

Why are rainbows not usually seen as complete circles

Because the ground is usually in the way

One a rainbow scene from an airplane sometimes forms a complete circle the plane's Shadow is

In the center of the rainbow

How does light travel in Optical fibers of uniform density

In straight line segments

Refraction of light in a diamond is greater for

Short wavelength light

If the speed of light in a medium is 2/3 the speed in a vacuum the mediums index of refraction is

0.67

Where does light travel the fastest

In a vacuum

What color does a raindrop disperse

All the colors of the rainbow

What type of lens spreads parallel light

Diverging lens

What path will light take from one point to another

The path of least time

Does the image from a pinhole camera become brighter or more clear when the hole is made larger

The image becomes brighter

When white light travels from air into water the color that refracts the most is

Violet

Is the average speed of light greatest in red orange green or blue glass

Red glass

Fermat’s principle of least time could also be the principle of least distance for the case of

Reflection

What does Fermat’s principle of least time apply to?

Both reflection and refraction

Do rainbows exist because of light refraction or reflection

Both of these

What is the angle of emergence when light passes through an ordinary window pane

The same as its angle of incidence

When is light emitted

When electron clouds of atoms are forced into oscillation

Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight..

Directly beneath you as far below water level as you are above

Two plane mirrors are at right angles to each other a coin placed near the mirrors has at most

Three images

Does frequency wavelength or speed of light change when it reflects off of the surface

None of these change

The twinkling of stars as seen from Earth is due to atmospheric

Refraction

Does atmospheric refraction make the day longer or shorter

Longer