![]() |
Criado por 18faishasu
quase 9 anos atrás
|
|
Questão | Responda |
What 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. |
What 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. |
What 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). |
How do you calculate the critical angle? | where 0c is the critical angle, and nr and ni are refractive indexes. |
How do you calculate the critical angle if light is passing from x medium into air? | because 1 is the refractive index of air. |
What material gives the smallest critical angle? | Diamond. |
What can total internal reflection be used for? | 1) Fibre optic cables. 2) Prismatic optical instruments. 3) Bicycle reflectors. |
How is total internal reflection used in optical fibres? | |
What are optical fibres used for? | Optical fibres are used in high-speed communications, such as cable TV and broadband. |
What 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. |
Quer criar seus próprios Flashcards gratuitos com GoConqr? Saiba mais.