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| Question | Answer |
| When 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. |
| Why is it called Total Internal Reflection? | As ALL the light is reflected BACK in T.I.R |
| Why do diamonds sparkle? | As they have a SMALL critical angle (thus can undergo TIR several times). They can be strategically cut |
| Uses of T.I.R | > telecommunication > CCTV > Bicycle reflectors > endoscopes |
| How 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. |
| How does T.I.R occur in 45 degree prisms? | |
| How 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) |
| What happens when light enters a denser medium. | It refracts and bends towards the normal |
| What happens when light enters a less dense medium. | It changes direction and bends away from the normal. |
| What happens to the refracted and reflected ray as you get closer to the critical angle? |
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