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Refraction

Nice animation of why refraction occurs Animation of wavefronts entering and exiting a glass block, travelling at a different speed in the different media. From explorelearning.com
4 Star

Introduction:
Examples of refraction all around us

Don't let the comments put you off! (thanks Dee :)) from Youtube. 2 minutes.

3 Star
       
Refraction: demonstrations
Refraction through a semi-circular glass block A 3D simulation of the refraction of light through a semi-crcular block. The angle of incidence can be varied upto and beyond the critical angle.
4 Star
An interactive teaching aid to show how light is refracted by a semi-circular block. The angle of the light source can be varied up to and beyond the critical angle.
4 Star
       
Refraction through a rectangular glass block A 3D simulation of the refraction of light through a rectangular block.
4 Star
An interactive teaching aid to show how light is refracted by a rectangular glass block. The optional protractor demonstrates that the incident and emerging beams of light are parallel.
4 Star
       
Why is light slower in glass? Youtube. 16 minutes from Sixty Symbols
4 Star
       
Snell’s Law Useful for demonstrating the mandatory experiment, and also for demonstrating Total Internal Reflection. Make sure to click on the "Next Scene" tab at the bottom right.
5 Star
       
Derivation of Snell's Law using Fermat's Principle One for the physics geeks, but if that's you then this is a real treat. Why has nobody mentioned the Principle of Least Time before?
4 Star
Also explains this strange phenomenon Also known as "brachistochrone" [brachistos - "shortest" and chronos - "time"]
4 Star
       
Critical angle      
Refraction through a semi-circular glass block Referred to previously. A 3D simulation of the refraction of light through a semi-crcular block. The angle of incidence can be varied upto and beyond the critical angle.
4 Star
       
Using TIR in LCD screens Youtube 5 minutes
3 Star
     
Optical fibres    

How optic fibres are made

Youtube 5 minutes. Discovery channel
4 Star
  Nice Introduction. Youtube. 9 minutes
4 Star
  Teacher demonstration. Youtube. 2 minutes  
  Nice Interactive simulation
4 Star
Including reference to multiplexing link Youtube. 5 minutes  
Why do we need new types of optical fibres? link Youtube. 2 minutes  
Application to nanotechnology Youtube. 7 minutes. I never really understood the term 'nanotechnology' untill I saw this.
5 Star
Short demonstration of Total Internal Relflection Lovely short (one minute) demonstration of TIR using a laser and stream of water from Teachersdomain.com
4 Star
Simple demonstration Youtube. 1 minute
4 Star
Nice demonstration Youtube. 2 minutes
4 Star
Close-up of a basic fibre Simple diagram from absorblearning.com
3 Star
Used in colonoscopy Text-based, with a diagram
3 Star
 

Click on "Colonoscopy: Inside a bottom" and navigate away

4 Star
  Video showing a living worm being removed from a colon. You really can find anything on Youtube. One minute.
5 Star
  Lou Rawls gives Damon Wayans a colon exam. Youtube comedy, one minute.
3 Star
How Optics Fibres are made YouTube. 5 mins
3 Star
Solving real-life problems Silly stuff from Youtube
3 Star
Nice black and white video on Refraction
From Scicast. 2 minutes.
4 Star
  CSI use the Refractive Index of glass to help solve a crime
4 Star
Demonstrating the same thing in a lab YouTube. 4 mins
4 Star
Same idea, simpler demo From Physics teacher Mr Reid
4 Star
Last variation From Steve Spangler. YouTube. 3 mins
3 Star