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Refraction - Coggle Diagram
Refraction
total internal reflection
Critical angle: when light travels from denser to rarer medium and angle of incidence whose corresponding angle of refraction is 90 degrees
occurs when light goes from a denser to a rarer medium and strikes the second medium with an angle of incidence greater then critical angle
when this happens light does not enter the second medium but is reflected back into the denser medium
Fibre optic cable: thin transparent rod through which light can travel by total internal reflection
Laws of refraction of light
1st law: the incident ray, the normal at the point of incidence and refracted ray all lie in the
SAME PLANE
2nd "Snell's" law: the ratio of the sine of angle of incidence to the sine of the angle of refraction is a constant
n= Sini/Sin r is constant= Refractive Index
the value of n depends on the 2 media in question and is called the refractive index of 2 media
aNg=Sin i/sin r= 1/gNa
Refractive index is always bigger than 1
Real depth+apparent depth
Object appears to be diverging from Q and thus P appears to be at Q
refractive index of water = aNw =real depth/apparent depth
Refractive index in terms of relative speeds
speed of light changes when it travels from 1 medium to another
RI of Medium =
Speed of Light in Air/Speed of light in medium
1N2=c1 /c2=sin i / sin r
When light travels from a rarer to a denser material the light is refracted towards the medium
Opposite when it travels from denser to rarer
The bending of a ray of light as it goes from one medium to another