Questions and Answers
What is the fundamental purpose of forensic photography?
Photography can only be performed using daylight as the light source.
False
Name one of the four photographic rays of modern photography.
X-rays, Ultraviolet rays, or Visible light
____________ is the mechanical and chemical result of photography.
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Match each term with its correct definition:
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Which component is NOT essential for producing a photograph?
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The camera obscura is a simple form of light projection.
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What is light projection?
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Which wavelength range corresponds to infrared rays?
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White light is formed when all wavelengths of visible light are of unequal quantity.
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What colors are known as the three primary colors of light?
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A(n) ______ object allows sufficient visible light to pass through it, enabling objects on the other side to be clearly seen.
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Match the types of objects with their behavior to light:
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What is the effect called when white light passes through a prism?
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A short duration light source provides illumination continuously.
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The wavelengths of visible light range from ______ to ______ nanometers.
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Study Notes
Introduction to Forensic Photography
- Forensic photography documents crime scenes and evidence for laboratory examination and court trials.
- Involves principles of photography and preparation of photographic evidence relevant to police work.
Discovery and Basics of Photography
- Light projection allows images to be viewed through a simple hole, similar to a pinhole camera concept.
- The camera obscura is an early device that paved the way for modern photography.
Core Concepts of Photography
- Object: The subject of the photograph; anything can be captured.
- Light: Principal source is daylight, essential for photography.
- Camera: The device used to capture images.
- Sensitized Material: Refers to film and photo paper used in the photographic process.
Definitions of Key Terms
- Photograph: Result of photography involving light and sensitized materials.
- Photography: Art/process of creating images through light on a sensitized surface using a camera.
- Police Photography: Study of photographic principles applied to police evidence collection.
- Forensic Photographer: A professional responsible for capturing images of crime scenes and evidence.
Principles of Light
- Light is a form of radiant electromagnetic energy traveling in waves.
- Speed of light: Approximately 186,000 miles or 300,000 kilometers per second in air.
The Four Photographic Rays
- X-rays: Wavelength of 1 – 30 nm.
- Ultraviolet rays: Wavelength of 30 – 400 nm.
- Visible light: Wavelength of 400 – 700 nm.
- Infrared rays: Wavelength of 700 – 1000+ nm.
Understanding Light and Radiation
- Light is defined as electromagnetic energy visible to the naked eye.
- The distinction between light and radiation includes visual sensations perceived by the retina.
White Light and Color Perception
- White light results when all visible wavelengths (400 – 700 nm) are perceived equally.
- Passing white light through a prism separates it into colors of the visible spectrum: red, orange, yellow, green, blue, violet.
- Primary colors of light are blue, green, and red, resulting from dividing visible light wavelengths.
Behavior of Objects with Light
- Transparent Objects: Allow clear passage of visible light, enabling clear viewing of objects behind them.
- Translucent Objects: Permit light passage but diffuse it, obscuring clear detail.
- Opaque Objects: Block light passage, making it difficult or impossible to see objects behind them.
Sources of Light
- Continuous Radiation: Provides sustained illumination, e.g., fluorescent lamps, gas lamps.
- Short Duration: Brief bursts of light, such as those from flash units.
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Description
This quiz will test your knowledge of forensic photography, including its principles and techniques. You'll learn about the role of photography in documenting crime scenes and the basics of how light and cameras work in this specialized field.
