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12 Cards in this Set
- Front
- Back
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What is the law of reflection |
Angle of reflection= Angle of incidence |
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How do you investigate refraction of light |
Yes using source of light and perspex block |
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Why does light refract |
Because as light enters a different medium at an angle one side is slowed down while the other carries on at the first faster speed |
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Equation for refractive index |
Refractive index= Sin Incidence/Sin Refractive |
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How do Optical fibres work |
Consist of central core surrounded by cladding that have low refractive index
Light signals pass through and always refract at angles higher than C |
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Equation for critical angle |
Sin C= 1/N |
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What is the critial angle |
the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected. |
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Difference between Analouge and Digital signal |
Analouge can take any value Digital can take 2 values on and off |
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Benefits of Digital |
Can withstand intereference Maintains quality |
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How does digital carry more information |
Easier to tell them apart when a signal doesnt lose quality |
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Why does refractive index have no units |
It's a ratio of speed of light so has no units as they cancel out |
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What happens when light is internally reflected |
Light changes speed |
