Forensic Photography quiz 2

Adrian Ramirez · 95問 · 2年前

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Is needed to produce a photograph.

light

It is a radiant electromagnetic energy that can be seen by the naked eye.

light

the foundation of the modern world.

electromagnetic spectrum

Are similar to ocean waves and that both are energy waves, they transmit energy

Electromagnetic waves

Longest electromagnetic wave but with lowest energy

Radio wave

Shortest wavelength but with highest energy waves

gamma rays

The average speed of light is _____________

186,000 miles per second. (299,792,458 meters / second)

The distance between crest is called _________

wavelength

The Electromagnetic Spectrum is divided into two the ___________

the invisible spectrum and the invisible spectrum

The light that cannot be detected by the naked eye is called the _________________.

invisible spectrum

have the longest wavelength but they have the lowest frequency. We use ___________ to send radio and television signals all around the world.

Radio waves

have the second longest wavelength. We use _________ in satellite communication, microwave cooking, and for RADAR

Microwave

produced by any hot bodies such as human and the sun. is used to cook food in conventional ovens.are also used in optical fibers for communication and even our TV’s remote control uses this kind of waves. In addition, chemist and forensic scientists use infrared spectrometry to identify the characteristics of many molecules.

Infrared waves

The main source of this is the sun. It is used to pick up invisible writings like in bank notes. It is also used by scientists to detect traces of blood and to analyze organic compound

Ultraviolet Radiation

have very short wavelength; they are able to penetrate many things.

X-Ray

is used to kill cancer cells, sterilize equipment, and to increase the shelve life of food.

Gamma rays

a range of visible light that produces different sensation when they strike human eyes.

Visible Spectrum

The wavelength that will produce white light is

400 to 700 nm

in 1666, proved that the light we see as white is a mixture of all colors of the spectrum.

Isaac Newton

When light falls on any material, the light is either ______

1. Reflected 2. Transmitted 3. Absorbed

The reflected light rays are the one that affect the eyes.

Reflection of light

A light that travels in straight lines are called _________

Rays

When light bounces off of an object or a surface

Reflection of light

States that when a ray of light is reflected from a smooth surface, the angle of reflection is equal to the angle of incidence, and the incident ray, the reflected ray, and the normal to the surface at the point of incidence all lay in the same plane.

Law of Reflection

stream of light with the smallest possible cross-sectional are.

Light Rays

defined as a ray approaching a surface whereby the point of incidence is where the ___________ strikes a surface

Incident Ray

is a construction line drawn perpendicular to the surface at the point of incidence

Normal

is the angle between the incident ray and the normal.

Angle of incidence

is the angle between the normal and the reflected ray

Angle of Reflection

TWO KINDS OF REFLECTED LIGHT

1. Specular Reflection 2. Diffuse Reflection

the mirror-like reflection of light (or of other kinds of wave) from a surface, in which light from a single incoming direction (a ray) is reflected into a single outgoing direction.

Specular Reflection

the reflection of light from a surface such that an incident ray is reflected at many angles rather than at just one angle as in the case of specular reflection.

Diffuse Reflection

A material transmits light when it allows the light to pass through it.

Transmission of light

allow all the light to pass through them so that you can easily see what is on the other side such as glass, water, and air.

Transparent Materials

scatter the light that passes through them you can tell that something is on the other side, but you cannot see details clearly

Translucent Material

The change in the direction of light is conclusive whenever light passes from one medium to another, is known as the

Phenomenon of Refraction

___________causes the light to bend taking direction according to _____________

Refraction Fermat's Principle

states that when light travels from one medium to another; it generally bends, or refracts.

Law of Refraction

who discovered the refraction

Willbrord Snellius

Two categories sources of light

1. Natural Light 2. Artificial Light

the light from sun, moon and stars.

Natural Light

light from man-made sources

Artificial Light

Kinds of lighting Situation

1. Direct Lighting 2. Diffused Lighting

it travels from a point source directly to the subject. Shadows created from this light are harsh and deep.

Direct Lighting

an example of ____________ is an overcast day, when the light appears evenly and there is no distinct shadow.

Diffused Lighting

Sources of Natural Light

1. Sunlight 2. Moon and Stars

the most important source of light on earth is the ____

Sun

The light from the sun travels through space at an incredible speed of ____________ and reaches the earth in ____________________

186,000 miles per second 8 minutes and 32 seconds

the most popular and mostly used light source of photographers

Sunlight

sunlight is classified into:

1. Hazy Sun 2. Distinct Sun 3. Cloudy 4. Overcast Sky 5. Heavy overcast

Images taken with __________ is characterized by extreme highlights and deep shadows. It provides the highest contrast in a picture.

Distinct Sun

It produces soft shadows and moderate highlight.

Hazy Sun

It does not cast practical shadows on your subject

Cloudy

It provides no shadows and low contrast.

Overcast Sky

It provides very poor contrast

Heavy Overcast

The first man-made light was _____.

Fire

examples of artificial sources of light:

1. Fill Flash 2. Strobe light 3. Flood Light 4. Street Light

it is used when backlighting is present and shadows obscure the object.

Fill-Flash

it is a quick burst of light like that on-camera flash unit, with much greater intensity

Strobe Light

it is popularly used to illuminate buildings, garage, parks, airport, tarpaulin billboards, etc.

Flood Light

it has the unique light angle direction that comes from front overhead lamp post.

Street Light

is great for photographing outdoor subjects. This light source with its strong intensity usually illuminates subjects as the main light

Distinct Sun

different kinds of light angles:

1. Front Lighting 2. Side Lighting 3. Back Lighting 4. Overhead Lighting

Qualities of Light

1. Hard Light 2. Soft Light 3. Ambient Light

it generatesdark shadows while highlights are saturated and harsh

Hard Light

it creates softedges between shadows and highlights

Soft Light

is the existing light in a room, in a coliseum or in a covered basketball court.

Ambient Light

This color is made of seven colors; Red, orange, yellow, green, blue, indigo, and violet

White

ROYBGIV color are also called _________

Visible Spectrum

the main colors in light

Red Green Blur

Red, Green and Blue are also called ________

Primary colors

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