Is a higher refractive index better?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
"Better" depends on the application:
Advantages of higher RI:
- More light bending for compact lens designs
- Greater brilliance in gemstones
- Better light confinement in optical fibers
- More effective prisms
Advantages of lower RI:
- Reduced reflective losses
- Better matching with air (less reflection)
- Lower chromatic aberration in some applications
For eyeglass lenses, higher RI allows thinner, lighter lenses. For gemstones, higher RI creates more sparkle. The "best" value is always context-dependent.
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