Flashcards
Total Internal Reflection
Flashcards do conjunto (10)
- 1What is total internal reflection?Total internal reflection is when a light ray hits the boundary between two materials of different densities and is reflected rather than refracted.
- 2What must happen for total internal reflection to occur?1) The angle of incidence must be greater than the critical angle.
2) The light must be passing from a medium with a higher refractive index to a medium with a lower refractive index. - 3What is the critical angle?The critical angle is when the angle of incidence produces an angle of refraction of 90° (or refraction along the boundary).
- 4How do you calculate the critical angle?where 0c is the critical angle, and nr and ni are refractive indexes.
- 5How do you calculate the critical angle if light is passing from x medium into air?because 1 is the refractive index of air.
- 6What material gives the smallest critical angle?Diamond.
- 7What can total internal reflection be used for?1) Fibre optic cables.
2) Prismatic optical instruments.
3) Bicycle reflectors. - 8How is total internal reflection used in optical fibres?
- 9What are optical fibres used for?Optical fibres are used in high-speed communications, such as cable TV and broadband.
- 10What two types of optical fibres are used in telecommunications?1) Step index fibre - the core is uniform with one refractive index while the outer cladding has a lower index.
2) Graded index fibre - the refractive index of the material gradually decreases outwards from the centre.
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- Descrição
- GCSE Total internal reflection.
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