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Index of Refraction from Light Speed — result sheet
Calculate a medium's refractive index and light-speed fraction from its supplied light speed.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Refractive index n = c/v, where c = 299792458 m/s is the exact speed of light in vacuum and v is the supplied medium speed.
This calculator evaluates the basic index-of-refraction relation from a supplied light speed. It returns n and the speed as a fraction of c while leaving wavelength dependence, absorption, material selection, and optical design outside the model.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Light speed in the medium — m/s; Positive light phase speed in the medium, no greater than c.; minimum 1; maximum 299792458
Worked example
| Input | Value |
|---|---|
| Light speed in the medium | 156000000 |
A light speed of 156000000 m/s corresponds to n = 1.921746526 and a speed fraction of about 0.52035c.
Assumptions and limits
- The entered speed is a positive finite phase speed expressed in metres per second.
- The exact SI speed of light in vacuum is used as c.
- The result describes the simple ratio relation at the supplied condition and does not model dispersion or absorption.
- Material characterization, lens design, waveguides, and optical safety are outside the calculation.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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