Forensic Anaylsis of Glass

Pre-Lab Questions

• Define the following terms:
  • Density
  • Refractive Index
  • becke line
  • concentric fracture
  • laminated glass
  • tempered glass
  • radial fracture
  • Birefringence
• How is density calculated?
• What is the density of water and what determines is an object will sink, float or suspend in water?
• When comparing glass density, what is the purpose of sodium polytungstate solution?
• When comparing glass refractive index, what is the purpose of silicone oil?
• When comparing glass refractive index, what is the purpose of heating the sample?
• What is the 3R Rule? How is it used to determine the direction of force?

Problem being addressed: Using the scenario develops the problem being investigated.

Researched-based Hypothesis: Based on knowledge of forensic microscopy and physical evidence, develop a researched based hypothesis. Support the hypothesis with at research.

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Outline the Procedures: summarize the procedures for each exercise.

Data and Results: (data sheets and drawings for each experiment): create data and drawings for each experiment (even if it has no data sheet provided), if data sheets are provided add the information to the data section.

Data Analysis and Forensic Application: Analysis the data based on forensic applications and the scenario. Specifically, state how the evidence data provides valuable information for solving the crime. Explain how the suspects were proven guilty or innocent based on the results.