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Refractive Index from Speeds

Calculate refractive index using the refractive index from speeds formula.

Refractive index: -
Visual representation

Refractive Index from Speeds diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

Reference: Formulae and Tables, State Examinations Commission (2014), page 61.
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How the Refractive Index from Speeds works

This calculator applies the formula given in Formulae and Tables, State Examinations Commission (2014), page 61. Enter values in consistent units.

Formula and inputs

vacuum ÷ medium

Inputs: Speed in vacuum, Speed in medium.

Using the result

The result is rounded to 6 decimal places. Check units, assumptions and significant figures before using the answer.

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