3410854
Description
Flashcards by Jonathan Sill, updated more than 1 year ago
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Created by Jonathan Sill
almost 9 years ago
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| Question | Answer |
| What is TIR? | TIR is where the reflection of ALL the incident light off the boundary occurs |
| How does TIR occur? | TIR occurs because the angle of refraction reaches a 90-degree angle before the angle of incidence reaches a 90-degree angle |
| What is the equation for TIR? | Sinc = nr/ni |
| What is TIR used for? | Fibre optics, polarising prisms and cameras used by surgeons |
| What is the critical angle? | It is the angle in different mediums that dictates when TIR occurs |
| What density conditions need to be met for TIR to occur? | The light must be going from a more dense to a less dense material |
| What angle conditions need to be met for TIR to occur? | The angle of incidence must be greater than the critical angle |
| What happens when TIR occurs, if you are standing on the other side of the medium? | The light would be reflected away, therefore you wouldn't even see the light |
| What material has a refractive index of one? | Air is the only material with an RI of 1 |
| What actually makes the light reflect back perfectly? | A change in speed of the material at which point the light pivots at any degree up to 90 |
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