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The total internal reflection occurs when the angle of incidence is greater than the critical angle,then why is there a need of high refractive index of the core and low refractive index of the cladding? alt text

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closed as off topic by Arjan, Diago Nov 6 '10 at 14:06

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i'm not entirely sure physics falls under superuser... ;p –  Journeyman Geek Nov 6 '10 at 10:47
    
thats what Super means lol. –  Fahad Uddin Nov 6 '10 at 11:22
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1 Answer

up vote 1 down vote accepted

The higher the difference between the refractive indices of the media at the interface, the steeper the critical angle.

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not depending upon which refractive index is higher and which is lower? –  Fahad Uddin Nov 6 '10 at 8:06
    
The critical angle only exists from the higher index to the lower index. –  Ignacio Vazquez-Abrams Nov 6 '10 at 8:07
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