Índice de Refração
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://unitfyi.com/iframe/glossary/refractive-index/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>
Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://unitfyi.com/glossary/refractive-index/
Add a dynamic SVG badge to your README or docs.
[](https://unitfyi.com/glossary/refractive-index/)
Use the native HTML custom element.
Definição
O índice de refração (n) de um meio é a razão entre a velocidade da luz no vácuo (c) e sua velocidade nesse meio: n = c/v.
Explicação
Vacuum has n = 1 by definition; water is approximately 1.33, meaning light travels 33% slower in water than in vacuum. Diamond's high index of 2.42 causes the dramatic bending and internal reflection that gives cut diamonds their brilliance. Optical fiber uses the refractive index difference between core and cladding to confine light by total internal reflection.
RELATED ARTICLES
A complete guide to the four temperature scales in scientific and everyday use—Celsius, Fahrenheit, Kelvin, and Rankine—including their history, conversion formulas, and where they intersect.
Speed Units Guide: MPH, KM/H, Knots, and MachA complete reference for speed units used around the world — from everyday driving speeds to the velocity of light.
Energy Units Guide: Joules, Calories, BTU, and Kilowatt-HoursA complete reference for energy units across physics, food science, electrical engineering, and fuel — with key conversions and real-world examples.
RELATED TERMS
Zero Absoluto
A menor temperatura possível: 0 K, -273,15 °C ou -459,67 °F.
Caloria
Unidade de energia; a caloria pequena (cal) eleva 1 g de água em 1 °C, enquanto a Caloria alimentar (kcal) equivale a 1000 calorias pequenas.
Número de Mach
A razão entre a velocidade de um objeto e a velocidade do som no meio ao redor.
Ano-Luz
A distância que a luz percorre em um ano no vácuo: aproximadamente 9,461 trilhões de quilômetros.
Elétron-Volt
Unidade de energia igual à energia cinética adquirida por um elétron acelerado através de uma diferença de potencial de 1 volt.