Forensics Glass

What type of fracture is this?

• Becke

• Conchodial

• Concentric

• Radial

What will NOT be visible if a glass and a liquid has the same refractive index?

• Conchoidal Lines

• Becke Lines

• Fracture Lines

• Radial Lines

What is the 1st step for handling glass at a crime scene?

• Identify and photograph any glass samples before moving them. 

• Collect the largest fragments that can be reasonably collected

• Identify the outside and inside surface of any glass

• If multiple panes are involved, make a diagram

What is the 2nd step for handling glass at a crime scene?

• Note trace evidence such as skin, hair, blood, or fibers. 

• Collect the largest fragments that can be reasonably collected

• Identify the outside and inside surface of any glass

• If multiple panes are involved, make a diagram

A detective at a crime scene finds a visible fingerprint on a glass surface that can be photographed. This type of fingerprint is classified as ___________.

• a plastic print

• a patent print

• a latent print

• an arch

• a whorl

What property of glass is most commonly used in forensic analysis to match fragments from a crime scene?

• Refractive index

• Color

• Thickness

• Weight

Which of the following is a method used to determine the refractive index of glass in forensic science?

• Density gradient method

• Becke line method

• Chromatography

• Spectroscopy

Tags

NGSS.HS-PS4-5

When examining glass fractures, what type of lines are formed on the side opposite to the force applied?

• Radial lines

• Conchoidal lines

• Becke lines

• Concentric lines

What is the primary reason for using glass density measurements in forensic investigations?

• To determine the age of the glass

• To identify the manufacturer

• To match glass fragments to a source

• To assess the glass's chemical composition

In forensic glass analysis, what does the term 'conchoidal fracture' refer to?

• A smooth, curved fracture surface

• A jagged, irregular fracture surface

• A fracture that follows the grain of the glass

• A fracture that occurs at a right angle