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Refractive Index Calculator

Compute refractive index n = c/v from speed of light in a medium.

Input Data

Input Speed in medium v.
m/s

Results

1.332411
n = c/v = 299792458 / 225000000 = 1.332411

At a glance:Refractive Index Calculator: enter parameters to compute results; complements related calculators.

Formula

n = c / v

c = 299792458 m/s (speed in vacuum)

How to Use

  1. Enter the speed of light in the medium v.
  2. Get refractive index n.

Case Studies

Water v≈2.25×10⁸ m/s

n ≈ 1.33.

FAQ

Can n<1?

Yes for phase velocity in some ranges; signal speed never exceeds c.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Refractive Index Calculator（/physics/refractive-index-speed）。