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Little Physics Excercise

Fkkize
Posts: 2,147
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7/14/2016 9:15:25 PM
Posted: 4 months ago
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?
: At 7/2/2016 3:05:07 PM, Rational_Thinker9119 wrote:
:
: space contradicts logic
Fkkize
Posts: 2,147
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7/14/2016 9:27:08 PM
Posted: 4 months ago
At 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
: At 7/2/2016 3:05:07 PM, Rational_Thinker9119 wrote:
:
: space contradicts logic
Fkkize
Posts: 2,147
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7/17/2016 11:57:13 AM
Posted: 4 months ago
No takers? How disappointing...
: At 7/2/2016 3:05:07 PM, Rational_Thinker9119 wrote:
:
: space contradicts logic
MagicAintReal
Posts: 590
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7/17/2016 1:29:51 PM
Posted: 4 months ago
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...
Fkkize
Posts: 2,147
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7/17/2016 3:09:43 PM
Posted: 4 months ago
At 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 :)
: At 7/2/2016 3:05:07 PM, Rational_Thinker9119 wrote:
:
: space contradicts logic