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Forensic Chapter 2 > Forensic chapter 2 > Flashcards

Forensic chapter 2 Flashcards

1
Q

What are the Basic Principles of Photography?

A

1.Electromagnetic radiation
2. Radiant Energy

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2
Q

Within the portion of the electromagnetic spectrum that can be perceived by the human eye.

A

Electromagnetic radiation

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3
Q

Usually defined as having wavelengths in the range of 400-700 nanometers

A

Visible light

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4
Q

That makes things visible is classified by the wavelength into a system known as the electromagnetic spectrum.

A

Radiant Energy

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5
Q

In 1945, New Mexico City, man for the first time transmitted a substantial quantity of matter into light, heat sound and motion which called ?

A

Energy

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6
Q

If matter sheds it’s mass and travels with the speed of light, it is called?

A

Radiation

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7
Q

The effect of light on the film is not visible in the formation of images of objects. To make it visible we need or require a chemical processing of the exposed film called?

A

Development

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8
Q

Too much in the amount of light will produce an?

A

Over exposed photograph

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9
Q

Too little will produce an?

A

Underexposed photograph

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10
Q

It is a form of energy

A

Light

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11
Q

Is basically a grouping of all electromagnetic radiation arranged according to the amount of energy contained in the radiation.

A

Electromagnetic Spectrum

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12
Q

is a part of this electromagnetic spectrum that creates the sensation of light when it falls on the human eye.

A

Visible Light

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13
Q

The properties of all electromagnetic radiation can be described by?

A

Three inter - related terms

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14
Q

What are the three inter related terms?

A

Wavelengths
Frequency
Energy

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15
Q

Biggest stars

A

Centauri Proxima

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16
Q

Sources of Light

A

1.Moon and Stars
2.Sunlight

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17
Q

It is when the sun sets, day turns into night and it becomes dark. The night sky has the mood and innumerable stars.

A

Moon and Stars

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18
Q

Actually has no light of its own, it reflects the light

A

Moon

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19
Q

The most popular and mostly used light source of photographers

A

Sunlight

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20
Q

Classification according to it’s intensity

A

1.Bright Sunlight/ Distinct Sun
2. Hazy Sunlight
3. Cloudy
4. Cloudy Bright
5. Cloudy Dull

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21
Q

It is the amount of light

A

Intensity

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22
Q

This is the direct sunlight striking the subject. It is the brightest of all

A

Bright sunlight/Distinct Sun

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23
Q

It is a ____ when the sun is COVERED BY THIN CLOUDS BUT STILL CLEARLY VISIBLE and it is illuminating your subject, It produces soft shadows and moderate highlight and contrast is also moderate, while rays are directional

A

Hazy Sunlight

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24
Q

Objects in open space cast no shadow. it is cloudy when the sun is shining bright but COVERED WITH THICK MOVING CLOUDS.

A

Cloudy

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25
Q

SUN IS BRIGHT BUT NOT VISIBLE, light is soft and not directional, skies may be covered with stationary cloud and it provides no shadows and low contrast.

A

Cloudy bright

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26
Q

This is practically the SAME AS OVERCAST SKY but generally darker and LIGHT IS DULL. It provides very poor contrast and static cloud is so thick where one cannot tell the overhead position of the sun.

A

Cloudy Dull

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27
Q

Those that can give illumination continuously

A

Continuous Radiation

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28
Q

It gives a brief flash of light produced by a burning metallic wire or an electrical discharge through a gas filled tube.

A

Short Duration

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29
Q

Light Angles

A
  1. Front Lighting
  2. Slide Lighting
  3. Back Lighting
  4. Overhead Lighting
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30
Q

Distinct sun is used as front lighting when it comes from BEHIND THE PHOTOGRAPHER.

A

Front Lighting

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31
Q

This type of lighting happen mostly in the morning and afternoon when the sunlight hits the subject from either the RIGHT OR LEFT FLANK OF THE PHOTOGRAPHER.

A

Side Lighting

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32
Q

This normally occurs at noontime where sun is directly ABOVE YOUR SUBJECT. This angle of lighting is generally not recommended for taking portraits

A

Overhead Lighting

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33
Q

Characteristics of Light
Theories of Light

A

1.Wavelength
2.Quantum Theory

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34
Q

Is the most pertinent, particularly in the design of lenses

A

Wavelengths Theory

35
Q

Theorized in 1990 that light might be made up of little bundles of energy named quanta.

A

Max Plank

36
Q

A Quantum of light is called?

A

Photon

37
Q

It is used to explain X - radiation and photo - electricity

A

Quantum Theory

38
Q

The different energies in the electromagnetic spectrum are the following

A

Cosmic rays
Gamma rays
X rays
UV rays
Visible light
Infra red rays
Heat rays
Hertzian waves
Alternating current oscillation

39
Q

The Rat Law

A

Reflected
Absorbed
Transmitted

40
Q

It occurs whenever an object changes the direction of a light wave but does not allow the wave to pass through it.

A

Reflection

41
Q

It is the change in direction of a wave due to a change in it’s speed. This is most commonly observed when a wave passes from one medium to another

A

Refraction

42
Q

It is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings

A

Diffraction

43
Q

Who discovered the speed of Light

A

Ole Romer 300k km/s

44
Q

This type of lighting happens when the sun strikes the subject from behind or when the sun is directly in front of the photographer.

A

Back Lighting

45
Q

Reflected light maybe?

A

Specular or Diffused

46
Q

When the light strikes the surface and rebound it is said to be reflected, and it is called?

A

Incident light

47
Q

The angle which it strikes is called?

A

Incident angle

48
Q

Mediums of Light

A
  1. Transparent Objects
  2. Translucent Objects
  3. Opaque Objects
49
Q

It allows sufficient visible light to pass through them that the object on the other side may be clearly seen. It transmits 90% or more of the incident Light

A

Transparent Objects

50
Q

It allows light to pass, however diffuse it sufficiently that objects on the other side may not be clearly distinguished. It transmits 50% or less of the incident light

A

Translucent Objects

51
Q

It is go greatly diffuse the light that recognizing the object on the other side is very difficult if not impossible. It divert or absorb light.

A

Opaque Objects

52
Q

Glowing under the UV Light

A

Photoluminescence

53
Q

Who is the creator of the wavelength

A

Christiaan huygens

54
Q

Simplistically, we can think of light travelling as a wave.

A

Wavelength

55
Q

Wavelength is denoted by the Greek letter?

A

Lambda

56
Q

The combined effect of the complete range of radiation between 400-700nm appears as ___ to the human eye.

A

White light

57
Q

Who introduce the electromagnetic spectrum?

A

Henrich Hertz

58
Q

Types of Visible Lights

A

Red
Orange
Yellow
Green
Blue
Indigo
Violet

59
Q

The light that cannot be detected by the naked eye is the?

A

Invisible spectrum

60
Q

The left region of the visible light is called?

A

Ultra Violet Region

61
Q

The right region of the visible light is called?

A

Infrared Region

62
Q

Invisible lights that are used in Modern Photography

A

Ultra Violet Region
Infrared Region

63
Q

Invisible Radiation with wavelength shorter than 400 MU

A
  1. Ultraviolet light
  2. X- ray
  3. Gamma rays
  4. Cosmic Rays
64
Q

Divided into the near and far ultraviolet and ranges from about 200-400 milimicrons wavelength. It is used to photograph fingerprints on multi- colored background, documents that are altered chemically or over writings and detection of secret writings.

A

Ultra Violet Theory

65
Q

Electromagnetic energy having a wavelength that ranges between 10-30 milimicrons. Objects which are opaque as seen by the naked eye can be presented by this.

A

X ray

66
Q

Used in recording or photographing objects hidden by opaque mediums.

A

Gamma rays

67
Q

Shortest wavelength

A

Gamma rays

68
Q

Highest energy

A

Gamma rays

69
Q

Cosmic rays are high energy charged particles, originating in outer space, that travel at nearly the speed of light and strike the earth from all directions. It is also coming from the stars and sun.

A

Cosmic rays

70
Q

Invisible Radiation with wavelength longer than 400 mu

A
  1. Infrared Light
  2. Radio Waves
  3. Microwaves
  4. Hertzian waves
71
Q

Lights having wave length greater than 700 milimicrons. It wavelength ranges from 700 - 800 milimicrons. It is not a color or any kind of red. It is an invisible rays and it’s only detected by the human skin as heat.

A

Infrared Light

72
Q

Also known as the blackout photography

A

Infrared light

73
Q

These light waves have the longest wavelength of all lights. Used for communicating through the modification and amplification of sound waves.

A

Radio Waves

74
Q

Excite the water molecules in food, heat them up, and pass the heat throughout the food.

A

Microwaves

75
Q

An electromagnetic wave produced by the oscillation of electricity in a conductor as a radio antenna and of a length ranging from a few millimeters to many kilometers.

A

Hertzian Waves

76
Q

Primary Colors of Light Rays

RGB

A
  1. Red
  2. Green
  3. Blue
77
Q

Secondary/ Complementary Colors of Light Rays

YCM

A
  1. Yellow
  2. Cyan
  3. Magenta
78
Q

Color Mixing of Lights
Color Addition

A
  1. Magenta + Yellow = White
  2. Magenta + Cyan = White
  3. Yellow + Cyan = White
  4. Red + Green + Blue = White
  5. Red + Blue = Magenta
  6. Red + Green = Yellow
  7. Blue + Green = Cyan
79
Q

Neutral colors

A

1.Gray
2.Black

80
Q

Color Subtraction

A
  1. White - Magenta = Green
  2. Cyan - Green = Blue
  3. Yellow - Green = Red
  4. Yellow - Red = Green
  5. White - Red = Cyan
  6. White - Blue = Yellow
  7. White - Green = Magenta
  8. White - Cyan = Red
  9. White - Yellow = Blue
81
Q

Primary Colors of Coloring Matters

A
  1. Red
  2. Yellow
  3. Blue
82
Q

Secondary Colors of Coloring Matters

A

Orange
Green
Violet

83
Q

Tertiary Colors of Coloring Matters

A

Yellow - Orange
Yellow - Green
Blue - Green
Blue - Violet
Red - Violet
Red - Orange

Forensic Chapter 2 (1 decks)

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