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# Little Physics Excercise

 Posts: 2,319 Add as FriendChallenge to a DebateSend a Message 7/14/2016 9:15:25 PMPosted: 1 year agoHad a physics exam today. Still feel like more of it, so here's a little excercise on ray optics for you guys.All light rays entering a fibre optic cable through it's face side are to be totally internally reflected. What is the minimal refractive index the cable needs to have for this?
 Posts: 13,776 Add as FriendChallenge to a DebateSend a Message 7/14/2016 9:23:00 PMPosted: 1 year ago17 units. Now all you have to do is figure out how much goes into a unit, and you have your answer.
 Posts: 2,319 Add as FriendChallenge to a DebateSend a Message 7/14/2016 9:27:08 PMPosted: 1 year agoAt 7/14/2016 9:23:00 PM, dylancatlow wrote:17 units. Now all you have to do is figure out how much goes into a unit, and you have your answer.That's how I pass all my tests
 Posts: 2,319 Add as FriendChallenge to a DebateSend a Message 7/17/2016 11:57:13 AMPosted: 1 year agoNo takers? How disappointing...
 Posts: 1,232 Add as FriendChallenge to a DebateSend a Message 7/17/2016 1:29:51 PMPosted: 1 year agoAt 7/14/2016 9:15:25 PM, Fkkize wrote:Had a physics exam today. Still feel like more of it, so here's a little excercise on ray optics for you guys.All light rays entering a fibre optic cable through it's face side are to be totally internally reflected. What is the minimal refractive index the cable needs to have for this?1.5?From my cursory wikipedia reading of everything...
 Posts: 2,319 Add as FriendChallenge to a DebateSend a Message 7/17/2016 3:09:43 PMPosted: 1 year agoAt 7/17/2016 1:29:51 PM, MagicAintReal wrote:At 7/14/2016 9:15:25 PM, Fkkize wrote:Had a physics exam today. Still feel like more of it, so here's a little excercise on ray optics for you guys.All light rays entering a fibre optic cable through it's face side are to be totally internally reflected. What is the minimal refractive index the cable needs to have for this?1.5?From my cursory wikipedia reading of everything...Sqrt(2), but close :)