The speed of light in a material is 
What is the critical angle of a light ray at the interface between the material and a vacuum?
Definitions:
Serial Killer
An individual who commits a series of murders, often with no apparent motive and typically following a characteristic, predictable behavior pattern.
Criminology
The scientific study of crime, its causes, responses by law enforcement, and methods of prevention.
Forensic Psychology
The intersection between psychology and the justice system, where psychologists apply their expertise in legal matters.
Competence Requirement
The necessary skills, knowledge, and abilities required to successfully perform a job or task.
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