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| Question | Answer |
| What is total internal reflection (TIR)? | Total Internal Reflection is when a light ray is reflected back into the medium it went in. Thus, the ray is unable to be seen from the other side. |
| What must happen in order for TIR to occur? (name 2 conditions) | 1. Angle of incidence> critical angle 2. The light ray must pass from a medium with a higher refractive index than the medium it ends in. Thus ni > nr. Light passes through a slow (dense) medium to a faster(less dense) medium. |
| How do you calculate refractive index? | n = sin i / sin r i = angle of incidence r= angle of refraction |
| What is the critical angle? | The critical angle is the angle of incidence produces an angle of refraction at 90 degrees. Different mediums have different critical angles. |
| How do you calculate the critical angle? | sin c = n r / n i n r = the refractive index of the medium the ray passed INTO. n i = the refractive index of the medium the ray STARTED in. |
| How do you calculate the critical angle of which the light ray passes from a medium into AIR? | sin c = 1/ni Since the refractive index of air is 1. |
| What are the uses of total internal reflection (TIR)? | Telecommunications ( Cable TV, Local area networks, CCTV) Medical use of Endoscopes Astronomy |
| What do mediums with a high refractive index usually have (critical angle)? | Mediums with a high refractive index usually have a low critical angle, thus T.I.R occurs a lot. For example diamonds diamonds have a low critical angle and thus T.I.R occurs more often which makes it appear sparkly. |
| Define angle of incidence and angle of refraction. | Angle of incidence is the angle between an incident ray and the normal. Angle of refraction is the angle between a refracted ray and the normal. |
| What is refractive index? | Refractive index of a material is a measure of the change in speed of light as it passes from a vacuum into the material. |
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