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Epic Vision > Composition Of Light > Flashcards

Composition Of Light Flashcards

1
Q

The theory that light is composed of a stream of invisible particles emitted by objects is _________?

A

Corpuscular theory

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2
Q

The theory that light travels in a series of waves moving outward from the source of light is called __________?

A

Electromagnetic Wave Theory

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3
Q

Particles of light are called_____?

A

Photons

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4
Q

Small particles

A

Corpuscular

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5
Q

This theory explains how light can be used to create electrical energy.

A

Corpuscular theory

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6
Q

This theory explains how light is broken into bands of colored light when it passes through a prism.

A

Electromagnetic wave theory

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7
Q

The up and down motion of a wave is at —

A

90 degrees

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8
Q

Light is measured by the length of its wave. What is a wave length?

A

The distance travelled forward by the light as it goes through one complete vibration

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9
Q

Visible light is measured in what units?

A

Nanometers

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10
Q

Visible light has wavelengths that range from ____ to _____ nanometers.

A

380-800

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11
Q

Red light is __________ nanometers.

A

800

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12
Q

Violet light is ______ nanometers.

A

380

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13
Q

Sunglasses that are UV400 will protect up to _______nanometers of UV light.

A

400

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14
Q

Which has a longer wavelength? Red or violet light

A

Red light is longer

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15
Q

The electromagnetic wave theory on how light travels states…

A

Light travels in waves, moving outward from the source of light.

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16
Q

How do you define the term, wavelength, as it is applied to light?

A

Wave length is the distance travelled forward by the light as it goes through one complete vibration, OR. The distance from the crest of one wave to the crest of another.

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17
Q

What is a single band of visible light called?

A

Ray

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18
Q

A group of rays is called…

A

A pencil of light

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19
Q

Because rays come from a single point, the rays in a pencil of light are _____________. (Diverging or converging)

A

Diverging

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20
Q

A group of pencils is called a _______.

A

Beam

A light bulb contains thousands of points of light from which rays emerge.

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21
Q

When you see search light in the sky at night, are you looking at a ray, a pencil, or a beam?

A

Beam

The source of light is not a single point of light, but an enormous number of lights.

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22
Q

If a beam of light is intercepted by an object, a ________ will be formed.

A

Shadow

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23
Q

True or false?

Light always comes from a single point.

A

False

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24
Q

A ray of light is a _____ band of visible light, made up of radiation of ____________.

A

Single

All wave lengths

25
Q

A pencil of light is a group of _______coming from a single point.

A

Rays

26
Q

A beam of light is a group of _______ coming from all the points on a light source.

A

Pencils

27
Q

A single band of visible light, of all wavelengths, is called a ______?

A

Ray

28
Q

Groups of diverging rays, coming from all the points on a light source, are called _________?

A

Beam

29
Q

A group of diverging rays, coming from a single point on a light source is called a _____?

A

Pencil

30
Q

What is the number of times a wave of radiation (light) vibrates in one second called?

A

Frequency

Think of a pond, after a stone has been tossed into it… frequency is the number of times a leaf, floating on the surface, bobs up and down in one second as the waves (caused by the stone) pass underneath it.

31
Q

There is a mathematical relationship between the wavelength, the frequency and the velocity of radiation waves. If a wave vibrates ten times each second (its frequency) and it travels forward one meter each time it vibrates (i.e. the distance from the crest of one wave to the crest of another is one meter-which is wavelength), what is the velocity of that wave?

A

10 meters per second

32
Q

Velocity, frequency and wavelength, if we know the value of any two of these, the third can be calculated. What would the formula be for— ?

Velocity=

A

Velocity= frequency x wavelength

33
Q

One vibration of a wave is called a ___?

A

Cycle

34
Q

One cycle per second is called a ___?

A

Hertz

35
Q

What is a unit of measure applied too visible light, equal to one billionth of a meter?

A

Nanometer

36
Q

What is the speed at which electromagnetic waves travel?

A

Velocity

37
Q

What is the distance travelled forward by the wave as it goes through one complete vibration?

A

Wavelength

38
Q

Light travels at what speed in the air?

A

186,282 miles a second

Rounded to 186,000

39
Q

When light enters any other substance- such as water or glass, it slows down.The speed of light in water is about _____?

A

140,000 miles per second

40
Q

In one particular crown glass, the speed of light is ___?

A

122,000 miles per second

41
Q

The chemical composition of the substance through which light is passing determines how fast the light will travel.
Different types of glass, therefore, with different chemical composition, permit light to pass through them at ______ speeds.

A

Different

42
Q

A comparison of the speed of light in the air with the speed of light after it has entered a substance is know as _________.

A

Index of refraction or refraction index

43
Q

The formula to determine the index of refraction of a substance is…

A

Index of refraction of the substance = speed of light in air/ speed of light in the substance

44
Q

Speed of light in water is 140,000 miles/second. What is the index of refraction of water?

A

186,000/ 140,000 = 1.3286

The index of refraction of water is 1.33

45
Q

The speed of light in the air is 1.33 times the speed of light in water.
What is the index of refraction of the crown glass in which light travels at 122,000 miles per second?

A

186,000/ 122,000 = 1.52

46
Q

The index of refraction of a particular flint glass is 1.65. Does light travel faster in this flint glass than in the crown glass with an index of refraction of 1.52… or slower?

A

Slower - - The speed of light in air is 1.53 times faster as the speed of light in crown glass, yet it is 1.64 times as fast as the speed of light in flint glass…where it is 113,000 mile/second

47
Q

If the speed of light is reduced in glass A by a greater amount than it is reduced in glass B, which glass has the higher index of refraction ? A or B?

A

Glass A

48
Q

If a beam of light strikes a substance at 90 degrees, the beam does or does not bend?

A

It does not bend.

49
Q

What instrument measures the vertex distance?

A

Distometer

50
Q

What is the angle equal to the difference between the angle of incidence and the angle of refraction of a ray of light passing through the surface between one medium and another of different refractive index?

A

Angle of deviation

51
Q

The slower or faster, the speed of light in that substance will create a greater angle of deviation?

A

Slower

52
Q

A comparison of the speed of light in air with the speed of light after it has entered a substance is called…

A

Index of refraction

53
Q

Refraction occurs due to the change in __________.

A

In the speed of light rays

54
Q

Plus power lenses are ____________ (convex or concave)?

A

Convex

55
Q

Concave means the lens is thinner or thicker at the edges?

A

Thicker

56
Q

Light converges in front of or behind the lens when you have a plus power lens?

A

Behind the lens.

57
Q

One prism diopter displaces an object one centimeter at a distance of _____ meter(s) from the eye.

A

One

58
Q

The ability of the eyes to take two different images and blend into one is called ____?

A

Binocular vision (fixation)

Epic Vision (4 decks)

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