Discussion
Which of the following is an optical property ?
Answer: B
The optical property is refractive index.
Refractive index is the ratio of the speed of light in a vacuum to its speed in the material, and it describes how much the material bends light. It is the most important property in comparing glass fragments in forensic work, measured by the immersion method or with a GRIM instrument.
Hardness and brittleness are mechanical properties, describing resistance to scratching and the tendency to fracture. Density is a physical property, mass per unit volume, used for glass and soil comparison too, but it has nothing to do with light.
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