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Forensic Chapter 2 > Forensic chapter 2 > Flashcards

Forensic chapter 2 Flashcards

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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
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.
Cloudy bright
26
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.
Cloudy Dull
27
Those that can give illumination continuously
Continuous Radiation
28
It gives a brief flash of light produced by a burning metallic wire or an electrical discharge through a gas filled tube.
Short Duration
29
Light Angles
1. Front Lighting 2. Slide Lighting 3. Back Lighting 4. Overhead Lighting
30
Distinct sun is used as front lighting when it comes from BEHIND THE PHOTOGRAPHER.
Front Lighting
31
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.
Side Lighting
32
This normally occurs at noontime where sun is directly ABOVE YOUR SUBJECT. This angle of lighting is generally not recommended for taking portraits
Overhead Lighting
33
Characteristics of Light Theories of Light
1.Wavelength 2.Quantum Theory
34
Is the most pertinent, particularly in the design of lenses
Wavelengths Theory
35
Theorized in 1990 that light might be made up of little bundles of energy named quanta.
Max Plank
36
A Quantum of light is called?
Photon
37
It is used to explain X - radiation and photo - electricity
Quantum Theory
38
The different energies in the electromagnetic spectrum are the following
Cosmic rays Gamma rays X rays UV rays Visible light Infra red rays Heat rays Hertzian waves Alternating current oscillation
39
The Rat Law
Reflected Absorbed Transmitted
40
It occurs whenever an object changes the direction of a light wave but does not allow the wave to pass through it.
Reflection
41
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
Refraction
42
It is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings
Diffraction
43
Who discovered the speed of Light
Ole Romer 300k km/s
44
This type of lighting happens when the sun strikes the subject from behind or when the sun is directly in front of the photographer.
Back Lighting
45
Reflected light maybe?
Specular or Diffused
46
When the light strikes the surface and rebound it is said to be reflected, and it is called?
Incident light
47
The angle which it strikes is called?
Incident angle
48
Mediums of Light
1. Transparent Objects 2. Translucent Objects 3. Opaque Objects
49
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
Transparent Objects
50
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
Translucent Objects
51
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.
Opaque Objects
52
Glowing under the UV Light
Photoluminescence
53
Who is the creator of the wavelength
Christiaan huygens
54
Simplistically, we can think of light travelling as a wave.
Wavelength
55
Wavelength is denoted by the Greek letter?
Lambda
56
The combined effect of the complete range of radiation between 400-700nm appears as ___ to the human eye.
White light
57
Who introduce the electromagnetic spectrum?
Henrich Hertz
58
Types of Visible Lights
Red Orange Yellow Green Blue Indigo Violet
59
The light that cannot be detected by the naked eye is the?
Invisible spectrum
60
The left region of the visible light is called?
Ultra Violet Region
61
The right region of the visible light is called?
Infrared Region
62
Invisible lights that are used in Modern Photography
Ultra Violet Region Infrared Region
63
Invisible Radiation with wavelength shorter than 400 MU
1. Ultraviolet light 2. X- ray 3. Gamma rays 4. Cosmic Rays
64
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.
Ultra Violet Theory
65
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.
X ray
66
Used in recording or photographing objects hidden by opaque mediums.
Gamma rays
67
Shortest wavelength
Gamma rays
68
Highest energy
Gamma rays
69
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.
Cosmic rays
70
Invisible Radiation with wavelength longer than 400 mu
1. Infrared Light 2. Radio Waves 3. Microwaves 4. Hertzian waves
71
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.
Infrared Light
72
Also known as the blackout photography
Infrared light
73
These light waves have the longest wavelength of all lights. Used for communicating through the modification and amplification of sound waves.
Radio Waves
74
Excite the water molecules in food, heat them up, and pass the heat throughout the food.
Microwaves
75
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.
Hertzian Waves
76
Primary Colors of Light Rays RGB
1. Red 2. Green 3. Blue
77
Secondary/ Complementary Colors of Light Rays YCM
1. Yellow 2. Cyan 3. Magenta
78
Color Mixing of Lights Color Addition
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
Neutral colors
1.Gray 2.Black
80
Color Subtraction
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
Primary Colors of Coloring Matters
1. Red 2. Yellow 3. Blue
82
Secondary Colors of Coloring Matters
Orange Green Violet
83
Tertiary Colors of Coloring Matters
Yellow - Orange Yellow - Green Blue - Green Blue - Violet Red - Violet Red - Orange

Forensic Chapter 2 (1 decks)

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