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- Total_external_reflection abstract "Total external reflection is an optical phenomenon where electromagnetic 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 emerges from under water. The optically denser material (water in this case) is the "internal" medium. For visible light, water has an index of refraction of 1.33 and for air it is very close to 1. For vacuum the index of refraction is exactly 1 for all wavelengths.For X-rays, however, all materials have indices of refraction slightly below 1. This entails that total reflection of X-rays only can occur when they travel through vacuum and impinge on a surface (at a small glancing angle). Since this kind of total reflection takes place outside of the material it is termed total external reflection. This makes it possible to focus X-rays (see, for example, NASA http://imagine.gsfc.nasa.gov/docs/science/how_l1/xray_telescopes.html)".
- Total_external_reflection wikiPageExternalLink xray_telescopes.html).
- Total_external_reflection wikiPageID "1064079".
- Total_external_reflection wikiPageRevisionID "573385106".
- Total_external_reflection hasPhotoCollection Total_external_reflection.
- Total_external_reflection subject Category:Geometrical_optics.
- Total_external_reflection type BodyPart105220461.
- Total_external_reflection type Eye105311054.
- Total_external_reflection type GeometricalOptics.
- Total_external_reflection type Organ105297523.
- Total_external_reflection type Part109385911.
- Total_external_reflection type PhysicalEntity100001930.
- Total_external_reflection type SenseOrgan105299178.
- Total_external_reflection type Thing100002452.
- Total_external_reflection comment "Total external reflection is an optical phenomenon where electromagnetic 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 emerges from under water. The optically denser material (water in this case) is the "internal" medium.".
- Total_external_reflection label "Total external reflection".
- Total_external_reflection label "全外反射".
- Total_external_reflection sameAs m.042v1k.
- Total_external_reflection sameAs Q7828119.
- Total_external_reflection sameAs Q7828119.
- Total_external_reflection sameAs Total_external_reflection.
- Total_external_reflection wasDerivedFrom Total_external_reflection?oldid=573385106.
- Total_external_reflection isPrimaryTopicOf Total_external_reflection.