3449673
Description
Flashcards by 18farzanaz, updated more than 1 year ago
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Created by 18farzanaz
over 8 years ago
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| Question | Answer |
| What does TIR stand for? | Total Internal Reflection |
| Define TIR | When the light ray is totally internally reflected, it unable to be seen on the other side. |
| What two conditions must be met for TIR? | 1. the angle of incidence must be greater than the critical angle 2. the light must pass from a medium with a higher refractive index to a medium with a lower one |
| Give an example of a condition where TIR will be observed | Light passing from glass to air with ∠i greater 42˚ |
| What are the uses of TIR? | • Fibre Optics Telecommunications • Medical Endoscopes |
| How is TIR used in fibre optics? | Reflects enormous amount of information as light rays over long distances |
| How to calculate TIR? | Calculate the critical angle |
| How to calculate critical angle? | sin c = n r / n i |
| How to calculate TIR when the light passes through a medium into air? | sin c = 1 / n i |
| Describe the relationship with refractive index and critical angles | An object with a higher refractive index will have a smaller critical angle e.g diamond = very sparkly |
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