Discussion
When the temperature of liquid is raised, its refractive index :
Answer: B
When a liquid is heated, its refractive index decreases.
Heating makes a liquid expand, so its density falls and there are fewer molecules per unit volume to slow the light. The refractive index therefore falls, by about 0.0004 to 0.0005 per degree Celsius for typical organic liquids.
This property is the basis of the glass refractive index measurement used in forensic glass comparison (the hot-stage method): a glass fragment is immersed in silicone oil, the oil is heated until its refractive index falls to match the glass, and the fragment's edges vanish at the match point.
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