Forensic Photography M3

A form of radiant electromagnetic energy that travels in wave motion and emanates heat.

Is the type of light that produces different sensations when it reaches the human eye

Lights whose wavelengths are either too short or long to excite the retina of the human eye

Refers to the speed of light, trablesoat 186, 282 millimicron/second

The distance measured between two successive crests or troughs of a wave, expressed in either millimicron or angstrom

The number of vibrations of the wavelength. Refers to the number of waves passing a given point in one second

It is the complete range of all types of radiation that has both electric and magnetic fields and travels in waves.

Light with a wavelength between 0.01 to 10 mm. Used to produce shadow photographs of internal structures of solid objects

Radiation with a wavelength of 30-40mm. Designed to photograph fingerprint on multi colored backgrounds, biological fluids, altered documents, erased and invisible writings. COMMERCIALLY KNOWS AS BLACK LIGHT

Radiation with a wavelength of 400-70, designed for ordinary photographic purposes.

Shortest Wavelength

Longest wavelength

Combination of blue and green

Combination of green and red

Combination of red and blue

Consider the photographic rays with longest wavelength, ranging from 700-1000 mm. It cannot see by eyes, but the skin can sense it as heat waves, causing sensation of warmth. Designed to photograph over-written documents, obliterated writing, and charred documents, or for blackout photography. REFERRED TO AS HEAT RAYS

It means light is produced by heat.

Also known as REFLECTORIZED LIGHT OR SPOTLIGHT. This lamp uses a reflector to focus light on the object being photographed

Chemical lamps that generate light through the rapid combustion of metal in oxygen. Ignited by a FLASH GUN and can only be used once as the bulb busts when fired electrically

Tube lamps with walls coated with materials capable of fluorescence

Special lamps capable of producing infra-red radiation. Useful for photographing objects in dark places.

Produces light by instantaneous electrical discharge between two electrodes in a gas filled bulb. Capable of arresting or stopping objects in fast motion

Gas lamp burning disulfide vapor in oxygen or nitric oxide. The bulb is made of glass transparent to uv light, commonly known as black light

___light rays affect the eyes. The object appears white when all wavelengths of visible light are __

No reflection from the subject, all wavelengths of visible rays are __, producing black ( absence of colors)

Rays of light pass through a transparent material,__ to the other side

Simply reflects all other colors of light that falls into it

Objects appear in their color under white light because they selectively reflect their color and absorb the rest.

Allows light to pass through so objects on the other side can be distinguished

Allows light to pass through but diffuses it so objects on the other side cannot be distinctly seen

Does not allow light to pass through

It is the bending of light rays as they strike a transparent material, such as when light passes through water

Occurs when the rays of light reach an opaque material

It is the study of light. It is concerned with the nature of light and the way it behaves in optical instruments

States that light is a series of waves that spread out in all directions from a source. It is the basis of optics and explains how light bends, reflects, and diffracts.

Huygens theory explained

Later opposed the wave theory, stating that light is made up of small particles called corpuscles, which are material particles that travel in a straight line at a finite speed.

Corpuscular Theory explained

States that light can behave as both wave and a particle, meaning it can exhibit wave-like properties like interference while also acting as discrete packets of energy called photons, proposing that light is made up of particles that move like waves. It success explained the PHOTOELECTRIC EFFECT, where light hitting a metal surface can eject electrons by proposing that photons transfer their energy directly to electrons