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Light
Refraction of Light
| Question | Answer |
|---|---|
| What is Refraction of Light | Refraction is the bending of light as it passes from one medium into another. |
| What is a transparent medium | A Transparent Medium is a substance through which light can travel and through which you can see clearly. |
| What are the laws of refraction | The incident ray, refracted ray and normal all lay in the same plane |
| What is the formula for the refractive index | Sin i Sin r |
| What does i stand for | Angle of Incidence |
| What does r stand for | Angle of Refraction |
| What does n stand for | Refractive Index |
| What is the relationship between angle of incidence and angle of refraction | As the angle of incidence increases, so does the angle of refraction, but they do not increase proportionally. |
| What happens to light when it enters a denser medium | When light travels from an optically rarer to a denser medium it is refracted towards the normal. |
| What happens to light when it enters a less dense medium | When light travels from an optically denser to a rarer medium it is refracted away from the normal. |
| What is the first law of Refraction of light | The incident ray, the normal at the point of incidence and the refracted ray all lie in the same plane. |
| What is the second law of Refraction of light (Snell's Law) | The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. Sin i over sin r = n (constant) |
| How do you get the refractive index of a medium (n) | Sin i over sin r |
| Formula for refractive index of a medium | Refractive index of a medium = speed of light in air speed of light in medium |
| What is the critical angle | When light travels from an optically denser to an optically rarer medium, the angle of incidence whose corresponding angle of refraction is 90° is called the critical angle (C) for those two media. |
| What is total internal reflection | When light goes from a denser to a rarer medium If the angle of incidence > critical angle (C): The light ray does not enter the second medium at all. It is completely reflected back into the first medium (laws of reflection). |
| What is Snell's Window | The circular cone of light visible to a diver looking up at the water’s surface due to refraction |
| Formula for speed of light in medium | Speed of light in medium = speed of light in air refractive index of a medium |
| What is the Relationship between refractive index and critical angle | Refractive index of a medium n=1 over Sin C |
| Applications of total internal reflection irl | Cat’s-eye reflectors, Corner cube reflectors (e.g. bicycle reflectors), Optical fibres |
| How do optical fibres work | Light enters and strikes the inside of the fibre. The ray is reflected to the opposite side (total internal reflection) The process continues, allowing the light to pass through the fibre. Light escapes from an overly curved optical fibre. |
| What happens if two optic fibres touch | If two optical fibres touch, light may escape one and pass into the other. Coating them with material with a lower refractive index prevents this from happening. |
| Uses of optical fibres in medical contexts | Endoscope Laparoscopic instruments |
Created by:
21JulianM
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