Flashcards
Total Internal Reflection
Cards in this deck (10)
- 1When does Total Internal Reflection occur?Occurs when...
> the angle of incidence is larger than the critical angle.
> the light is in the more dense medium and approaching the less dense medium. - 2Why is it called Total Internal Reflection?As ALL the light is reflected BACK in T.I.R
- 3Why do diamonds sparkle?As they have a SMALL critical angle (thus can undergo TIR several times). They can be strategically cut
- 4Uses of T.I.R> telecommunication
> CCTV
> Bicycle reflectors
> endoscopes - 5How do optic cables work?They work as they send signals as through the from of light. The light is transmitted through T.I.R. It efficient the all light gets reflected.
- 6How does T.I.R occur in 45 degree prisms?
- 7How do you calculate the critical angle?Sin c = nr / ni
c - the critical angle
nr = refractive index of what medium the light is passing into (lighter density)
ni = refractive index of what medium the light in is (heavier density) - 8What happens when light enters a denser medium.It refracts and bends towards the normal
- 9What happens when light enters a less dense medium.It changes direction and bends away from the normal.
- 10What happens to the refracted and reflected ray as you get closer to the critical angle?
