sciart Posted March 17, 2006 Share Posted March 17, 2006 Do you think total internal reflection is a kind of refraction?why? Link to comment Share on other sites More sharing options...
timo Posted March 17, 2006 Share Posted March 17, 2006 What do you think? And why? Link to comment Share on other sites More sharing options...
sciart Posted March 17, 2006 Author Share Posted March 17, 2006 I am not sure . Link to comment Share on other sites More sharing options...
Klaynos Posted March 17, 2006 Share Posted March 17, 2006 Consider what is happening and what refraction is, and then compare the two... Link to comment Share on other sites More sharing options...
mattbimbo Posted March 17, 2006 Share Posted March 17, 2006 yes, the phenomenon of TIR causes 100% reflection of the incident wave. well maybe not 100%, but close to, because there is a phenomena involving TIR and the propagation of an evanescent wave. Link to comment Share on other sites More sharing options...
swansont Posted March 17, 2006 Share Posted March 17, 2006 yes, the phenomenon of TIR causes 100% reflection of the incident wave. well maybe not 100%, but close to, because there is a phenomena involving TIR and the propagation of an evanescent wave. Why do you consider that refraction? Reflection still happens at angles where refraction can occur. Link to comment Share on other sites More sharing options...
mattbimbo Posted March 17, 2006 Share Posted March 17, 2006 TIR occurs at the interface of two media. the angle of TIR is determined by the relative refractive indices of the two media. Link to comment Share on other sites More sharing options...
swansont Posted March 18, 2006 Share Posted March 18, 2006 TIR occurs at the interface of two media. the angle of TIR is determined[/b'] by the relative refractive indices of the two media. Reflection occurs at the interface of two media as well. The angle of the reflection is not determined by the indices; the angle where refraction fails to occur is. Link to comment Share on other sites More sharing options...
mattbimbo Posted March 21, 2006 Share Posted March 21, 2006 swansont is right. TIR always appears in text books under refraction. maybe swansont will approve of this - when light is incident on a surface both reflection and refraction take place, however in the case of TIR, no refraction is observed, hence the name TIR. Link to comment Share on other sites More sharing options...
swansont Posted March 21, 2006 Share Posted March 21, 2006 swansont is right. TIR always appears in text books under refraction. maybe swansont will approve of this - when light is incident on a surface both reflection and refraction take place' date=' however in the case of TIR, no refraction is observed, hence the name [b']TIR[/b]. Not that my approval is necessary, but that's the direction my argument was going, so I agree. TIR occurs because of the absence of refraction. BTW, there are some neat underwater shots I've seen that show this. The area you can see outside the water is "Snell's window" (or circle) and outside of that everything is undergoing TIR, unless there is some disturbance in the water, in which case the direction of the normal changes. Link to comment Share on other sites More sharing options...
s pepperchin Posted April 10, 2006 Share Posted April 10, 2006 Do you have a link where we could see this picture? Link to comment Share on other sites More sharing options...
swansont Posted April 10, 2006 Share Posted April 10, 2006 I haven't been able to find the one I'm thinking of (a diving swimmer just entering the pool) online, but here is a pretty good one, and another that shows part of Snell's circle. Link to comment Share on other sites More sharing options...
swansont Posted October 5, 2006 Share Posted October 5, 2006 Found some more TIR swimming pics by Heinz Kluetmeier http://pdngallery.com/legends/heinz/intro2.html http://pdngallery.com/legends/heinz/main06.html http://sportsillustrated.cnn.com/multimedia/photo_gallery/0608/gallery.swimming/content.4.html http://sportsillustrated.cnn.com/multimedia/photo_gallery/0608/gallery.swimming/content.8.html Link to comment Share on other sites More sharing options...
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