What are the three types of refractive index?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
While two types are commonly discussed, three classifications sometimes referenced include:
- Absolute Refractive Index: Measured against vacuum
- Relative Refractive Index: Measured between two media
- Group Refractive Index: Related to the velocity of light pulses rather than individual waves, important in fiber optics and telecommunications
Some sources also categorize by measurement conditions (temperature, wavelength, pressure)
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