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VIII Light and Optics 1.26.22 > VIII Light and Optics > Flashcards

VIII Light and Optics Flashcards

1
Q

What is light?

A

Light is a form of energy that travels in waves.

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2
Q

What is energy?

A

Energy is the ability to cause change.

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3
Q

Light appears white yet is ______________________________________.

A

Light appears white yet is MADE UP OF ALL THE COLORS OF THE RAINBOW.

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4
Q

Each color has different ____ and ____.

A

Each color has different WAVELENGTH** and **STRENGTH.

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5
Q

____ has the longest wavelength and lowest energy.

A

RED has the longest wavelength and lowest energy.

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6
Q

____ has the shortest wavelength and highest energy.

A

VIOLET has the shortest wavelength and highest energy.

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7
Q

Light can travel through ____, ____, ____, and ____.

A

Light can travel through SOLIDS, LIQUIDS, GASSES, and VACUUM.

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8
Q

What is a vacuum?

A

Vacuum is an area with no matter/molecules whatsoever.

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9
Q

Light travels much quicker than ____.

A

Light travels much quicker than SOUND.

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10
Q

You ____ lightening before you ____ thunder.

A

Your SEE** lightening before you **HEAR thunder.

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11
Q

Light travels through a vacuum at ____ million meters per second / ____ miles per second. This is believed to be the fastest speed possible in our universe.

A

Light travels through a vacuum at 300** million meters per second / **186,000 miles per second. This is believed to be the fastest speed possible in our universe.

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12
Q

Jet airplanes can fly at several times the speed of ____, but no human-made machine can travel at the speed of ____.

A

Jet airplanes can fly at several times the speed of SOUND**, but no human-made machine can travel at the speed of **LIGHT.

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13
Q

Light travels in ____ ____ or ____ spreading in all directions from a source.

A

Light travels in STRAIGHT LINES** or **RAYS spreading in all directions from a source.

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14
Q

Light cannot ____ or ___ around objects without help.

A

Light cannot BEND** or **CURVE around objects without help.

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15
Q

What are the reasons why shadows outline fingers?

A

Shadows outline fingers because of Penumbra and Umbra.

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16
Q

What is reflected light?

A

Reflected light is the light that bounces off the surfaces of objects.

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17
Q

Most light that reaches your ____ is reflected light.

A

Most light that reaches your EYE is reflected light.

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18
Q

Depending on the ____ of the surface, you may or may not be able to see your own reflection.

A

Depending on the TEXTURE of the surface, you may or may not be able to see your own reflection.

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19
Q

What do smooth surfaces do?

A

Smooth surfaces reflect images.

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20
Q

Give an example of a smooth surface that reflects images?

A

glass

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21
Q

The smooth surface means that light rays all hit the object at the ____ ____ and bounce off at the ____ ____. This creates an image that is reflected back to you.

A

The smooth surface means that light rays all hit the object at the SAME ANGLE** and bounce off at the **SAME ANGLE. This creates an image that is reflected back to you.

22
Q

What are rough surfaces?

A

Rough surfaces are surfaces that do not reflect images.

23
Q

Give an example of a rough surface.

A

walls

24
Q

The rough surface means that all light rays hit the object ____ ____ ____ but then bounce off at ____ ____ ____ ____. The light is mixed, and no reflection can be created.

A

The rough surface means that all light rays hit the object AT AN ANGLE** but then bounce off at **AT A DIFFERENT ANGLE. The light is mixed, and no reflection can be created.

25
Q

____ are smooth glass coated with a silvery material that reflects almost all the light that hits it, creating an image.

A

MIRRORS are smooth glass coated with a silvery material that reflects almost all the light that hits it, creating an image.

26
Q

Mirrors may be ____, ____ ____, or ____.

A

Mirrors may be STRAIGHT, CALLED PLANE,** or **CURVED.

27
Q

A curved mirror is ____ or ____.

A

A curved mirror is CONCAVE** or **CONVEX.

28
Q

What is a plane mirror?

A

A plane mirror is a mirror with a perfectly flat surface.

29
Q

A plane mirror reflects an almost ____, ____ ____ ____, and ____ ____ image.

A

A plane mirror reflects an almost IDENTICAL, RIGHT SIDE UP,** and **ACCURATELY SIZED image.

30
Q

What is a concave mirror?

A

A concave mirror has a reflective side that bends INward.

31
Q

The reflected image of a concave mirror may be ____ ____ ____, ____ ____, bigger or smaller.

A

The reflected image of a concave mirror may be RIGHT SIDE UP, UPSIDE DOWN, bigger or smaller.

32
Q

What is a convex mirror?

A

A convex mirror has a reflective side that bends OUTward.

33
Q

The reflected image of a convex mirror can be bigger or smaller and will ALWAYS be ____ ____ ____.

A

The reflected image of a convex mirror can be bigger or smaller and will ALWAYS be RIGHT SIDE UP.

34
Q

Most objects’ surfaces do not reflect all light and instead ____ ____ or allow it to ____ ____.

A

Most objects’ surfaces do not reflect all light and instead ABSORB IT** or allow it to **PASS THROUGH.

35
Q

____ objects do not allow light waves to pass through.

A

OPAQUE objects do not allow light waves to pass through.

36
Q

Examples of opaque objects are ____ , ____, and ____.

A

Examples of opaque objects are WOOD, CARDBOARD**, and **METAL.

37
Q

____ objects allow light waves to pass through.

A

TRANSPARENT objects allow light waves to pass through.

38
Q

Examples of transparent objects are ____ and ____.

A

Examples of transparent objects are GLASS** and **WATER.

39
Q

____ objects transmit light but scatter the rays so that images seen through them look fuzzy.

A

TRANSLUCENT objects transmit light but scatter the rays so that images seen through them look fuzzy.

40
Q

Examples of translucent objects are ____ ____ and ____ ____.

A

Examples of translucent objects are WAX PAPER** and **FROSTED GLASS.

41
Q

Objects do not create or give off their own ____.

For example, you can’t tell what color a blue book is in a pitch-black room since the book does ____ ___ ___ ____.

A

Objects do not create or give off their own LIGHT.

For example, you can’t tell what color a blue book is in a pitch-black room since the book does NOT EMIT BLUE LIGHT.

42
Q

Opaque objects appear to have a certain color since they ____ the same wavelengths of white light and ____ other wavelengths.

A

Opaque objects appear to have a certain color since they ABSORB** the same wavelengths of white light and **REFLECT other wavelengths.

43
Q

____ ____ is made up of all the colors of the rainbow.

A

WHITE LIGHT is made up of all the colors of the rainbow.

44
Q

The color you see when you look at an object is ____ ____.

A

The color you see when you look at an object is REFLECTED LIGHT.

45
Q

____ light is “sucked in” by an object and does not reach your eyes.

A

ABSORBED light is “sucked in” by an object and does not reach your eyes.

46
Q

Red shirts appear red because particles in the material ____ red light and ____ all other colors.

A

Red shirts appear red because particles in the material REFLECT** red light and **ABSORB all other colors.

47
Q

Black materials absorb ____ light waves and reflect ____.

A

Black materials absorb ALL** light waves and reflect **NONE.

48
Q

____ is the absence of light and ___ a true color.

A

BLACK** is the absence of light and **NOT a true color.

49
Q

Since black materials absorb light, they tend to be ____ when placed in sunlight.

A

Since black materials absorb light, they tend to be WARMER when placed in sunlight.

50
Q

____ (____) colored materials reflect all light waves and absorb none.

A

WHITE (LIGHT) colored materials reflect all light waves and absorb none.

51
Q

Since white materials reflect light, they tend to stay ____ when placed in sunlight.

A

Since white materials reflect light, they tend to stay COOLER when placed in sunlight.

VIII Light and Optics 1.26.22 (4 decks)

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