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🔍 折射率计算器Index of Refraction Calculator
由光在介质中的速度计算折射率 n = c/v，或用斯涅尔定律 n₁·sin θ₁ = n₂·sin θ₂ 求折射角，并给出全反射临界角；内置空气、水、玻璃、钻石等常见介质的折射率。Calculate the refractive index n = c/v from the speed of light in a medium, or use Snell's law n₁·sin θ₁ = n₂·sin θ₂ to find the refraction angle and the critical angle for total internal reflection, with common media built in.
使用说明与常见问题How-to & FAQ
「折射率计算器」是什么？What is the Index of Refraction Calculator tool?
由光在介质中的速度计算折射率 n = c/v，或用斯涅尔定律 n₁·sin θ₁ = n₂·sin θ₂ 求折射角，并给出全反射临界角；内置空气、水、玻璃、钻石等常见介质的折射率。Calculate the refractive index n = c/v from the speed of light in a medium, or use Snell's law n₁·sin θ₁ = n₂·sin θ₂ to find the refraction angle and the critical angle for total internal reflection, with common media built in.
如何使用「折射率计算器」？How do I use the Index of Refraction Calculator tool?
在「折射率计算器」中，填写「计算」、「入射介质折射率 n₁」、「折射介质折射率 n₂」、「入射角 θ₁（度）」、「介质中光速 m/s」等参数，结果会随输入实时计算并显示在下方。In the Index of Refraction Calculator: Fill in "Calculate", "Incident medium n₁", "Refracting medium n₂", "Angle of incidence θ₁ (degrees)", "Speed of light in the medium m/s"; results are recalculated instantly as you type.
折射率是什么？What is the refractive index?
n = c ÷ v，光在真空中的速度与在介质中速度之比。真空 n = 1，空气约 1.0003，水约 1.333，常见玻璃约 1.5，钻石约 2.417（均为可见光典型值，随波长略有变化）。n = c ÷ v, the vacuum speed of light divided by the speed in the medium. Vacuum is 1, air about 1.0003, water about 1.333, common glass about 1.5 and diamond about 2.417 (typical visible-light values; they vary slightly with wavelength).
斯涅尔定律和临界角？Snell's law and the critical angle?
n₁ sin θ₁ = n₂ sin θ₂。从光密介质射向光疏介质（n₁ > n₂）时，入射角超过临界角 θc = arcsin(n₂/n₁) 会发生全反射，例如水到空气约 48.6°。n₁ sin θ₁ = n₂ sin θ₂. Going from a denser to a less dense medium (n₁ > n₂), angles beyond the critical angle θc = arcsin(n₂/n₁) are totally reflected, about 48.6° from water to air.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「折射率计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Index of Refraction Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「折射率计算器」免费吗？需要注册吗？Is the Index of Refraction Calculator free? Do I need an account?
「折射率计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Index of Refraction Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.