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How Fiber Optics Work Presentation

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How Fiber Optics Work Basic Terms. ✓Refraction of light: As a light ray passes from one transparent medium to another, it changes direction; this phenomenon is called refraction of light. How much that light ray changes its direction depends on the refractive index of the mediums. ✓ Refractive Index: Refractive index measures how much a material refracts light. Snell’s Law ✓ ✓ Willebrord Snell derived the relationship between the different angles of light as it passes from one transparent medium to another. When light passes from one transparent material to another, it bends according to Snell's law which is defined as: n1sin(θ1) = n2sin(θ2) ⚫ ⚫ ⚫ ⚫ n1 is the refractive index of the medium the light is leaving θ1 is the incident angle between the light beam and the normal (normal is 90° to the interface between two materials) n2 is the refractive index of the material the light is entering θ2 is the refractive angle between the light ray and the normal Total Internal Reflection ⚫ When a light ray crosses an interface into a medium with a higher refractive index, it bends towards the normal. Conversely, light traveling cross an interface from a higher refractive index medium to a lower refractive index medium will bend away from the normal. ⚫ ⚫ At some angle, known as the critical angle θc, light traveling from a higher refractive index medium to a lower refractive index medium will be refracted at 90°; in other words, ref ...
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