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Physics - CIE
Light Waves
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Physics
Physics - CIE
10th
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10 Terms
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Reflection
Light ray strikes plane (eg. Mirror) and returns to originating source.
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Law of reflection
Angle of incidence=angle of reflection
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Refraction
Light ray strikes plane and passes through the medium, altering ray speed
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Normal
Line perpendicular to surface
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Direction of refracted light in a denser medium
Towards the normal
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Direction of refracted light in a less dense medium
Away from the normal
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Total internal reflection (TIR)
When a refracted ray should be bigger than 90° it is reflected inside the more dense medium following the law of reflection
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Critical angle
The minimum angle at which internal reflection takes place- happens when ray changes from just refracting to TIR
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Uses of total internal reflection
Endoscope
Optical fibre broadband internet
Decorative fibre lights
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Equation linking critical angle and ref reactive index
n=1/sinC
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