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Total external reflection is a phenomenon traditionally involving X-rays, but in principle any type of electromagnetic or other wave, closely related to total internal reflection. Total internal reflection describes the fact that radiation (e.g. visible light) can, at certain angles, be totally reflected from an interface between two media of different indices of refraction (see Snell's law). Total internal reflection occurs when the first medium has a larger refractive index than the second medium, for example, light that starts in water and bounces off the water-to-air interface.

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  • Total external reflection (en)
  • 全外反射 (zh)
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  • 全外反射是一種光學現象,電磁輻射(即可見光)-在某些角度- 會被從兩種折射率不同介質的界面完全反射回原介質(參考斯涅爾定律)。全內反射發生在第一種介質的折射率大於第二種介質,例如,湧現在水面下的光。光學密級的材料(在這個例子是水)是內部的介質。對可見光,水的折射率是1.33,空氣的折射率非常接近1。在真空中,所有波長的折射率都是1。 但是對X-射線而言,所有介質的折射率都僅略小于1,這使得X-射線在真空中的全反射只能在以很小的角度撞擊時才能發生。X射线能产生全反射,但是其极小,一般不会超过20'~30'。 由於這種全反射發生在介質的外面,因此被稱為全外反射。 (zh)
  • Total external reflection is a phenomenon traditionally involving X-rays, but in principle any type of electromagnetic or other wave, closely related to total internal reflection. Total internal reflection describes the fact that radiation (e.g. visible light) can, at certain angles, be totally reflected from an interface between two media of different indices of refraction (see Snell's law). Total internal reflection occurs when the first medium has a larger refractive index than the second medium, for example, light that starts in water and bounces off the water-to-air interface. (en)
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  • Total external reflection is a phenomenon traditionally involving X-rays, but in principle any type of electromagnetic or other wave, closely related to total internal reflection. Total internal reflection describes the fact that radiation (e.g. visible light) can, at certain angles, be totally reflected from an interface between two media of different indices of refraction (see Snell's law). Total internal reflection occurs when the first medium has a larger refractive index than the second medium, for example, light that starts in water and bounces off the water-to-air interface. Total external reflection is the situation where the light starts in air and vacuum (refractive index 1), and bounces off a material with index of refraction less than 1. For example, in X-rays, the refractive index is frequently slightly less than 1, and therefore total external reflection can happen at a glancing angle. It is called external because the light bounces off the exterior of the material. This makes it possible to focus X-rays. (en)
  • 全外反射是一種光學現象,電磁輻射(即可見光)-在某些角度- 會被從兩種折射率不同介質的界面完全反射回原介質(參考斯涅爾定律)。全內反射發生在第一種介質的折射率大於第二種介質,例如,湧現在水面下的光。光學密級的材料(在這個例子是水)是內部的介質。對可見光,水的折射率是1.33,空氣的折射率非常接近1。在真空中,所有波長的折射率都是1。 但是對X-射線而言,所有介質的折射率都僅略小于1,這使得X-射線在真空中的全反射只能在以很小的角度撞擊時才能發生。X射线能产生全反射,但是其极小,一般不会超过20'~30'。 由於這種全反射發生在介質的外面,因此被稱為全外反射。 (zh)
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