n= sin i/sin r
n = refractive index
i = angle of incidence
r = angle of refraction
or
refractive index =velocity of light /phase velocity
phase velocity =lambda/time
For the refractive index of a certain substance:
n=velocity of light in a vacuum/velocity of light in the substance
Refractive index of a medium = speed of light in air / speed of light in medium
If a ray of light passes from air into that medium then the refractive index (R.I) can be given by:
R.I = sin(angle in air) / sin(angle in medium)
Angle in air is the angle between the ray of light and the normal in air.
Refractive index of a medium is defined as the ratio of the speed of light in free space to that in the given medium.
The speed of light in free space is 3 x 108 m/s
The speed of light in glass is found to be 2 x 108
So the refractive index of glass with respect to free space is 3/2
So mu = 1.5 (no unit)
you measure the angle of the incident ray from the normal, then the refractive ray from the normal then you "sin" the incident ray and the refractive ray and then put the incident ray "sined" over the refractive ray to find the refractive index
Measure the angle between the incident ray and the normal as well as between the refracted ray and the normal. *Note* the normal is an imaginary line perpendicular to the surface. Once u get your angles use Snells Laws:
n1sin(theetha)1=n2sin(theetha)2
Assume that the refractive index of the incident ray is 1.00.
There are so many ways to determine the refractive index of liquid
1) Using spectrometer with a hollow prism filled with the liquid
2) By Boy's method if liquid is available only in small amount
3) Using travelling microscope pouring liquid in a hollow rectangular slab
Sadly, there is only one:
Refractive index of a material = speed of light in vacuum/speed of light in the material
(n2-1)/(n2+2)=((Nq2)/3E0m)*sum overj of fj/(w02j-w2+iyjW)sqrt(permitivity*permeability/vacuum permitivity*permeability)
The index of refraction can be defined as the ratio of the speed of light in a vacuum, to the speed of light in the corresponding material.However, this speed can be hard to measure directly; I believe in practice you would most likely measure angles of the light, and then use Snell's Law.
The refractive index is the (angle of incidence/angle of refraction).
It can also be found by doing (1/sin c) where 'c' is the critical angle.
Index Of Refraction
A medium with a higher index of refraction, like diamond, is more dense than the medium with a lower index of refraction, like air. If the ray of light is moving from the less dense medium (lower index of refraction), to a more dense (higher index of refraction) the ray of light bends TOWARDS the normal.
The ray of light bends towards the normal.
n(index of refraction) = c(speed of light in a vacuum)/v(speed of material in the sebstance)
Every substance has its own index of refraction. The index of refraction affects the speed of the light passing through it. Air has an index of refraction of about 1.00 whereas water has an index of refraction of about 1.33. a simple ratio formula can be used to determine the final speed of the light through the water. (Vi/Vf)=(Ni/Nf) where v is the speed of light and N is the index of refraction. The angle would also change. The path of the light would 'bend' toward the normal line which is an imaginary line that runs perpendicular to the line where the air meets the water. Equation to find angle is (N2/N1) = Sin(angle1)/Sin(angle2).
Umm... E=MC²
Q: How do you think increasing a medium's index of refraction might affect the angle of refraction?
Index Of Refraction
A medium with a higher index of refraction, like diamond, is more dense than the medium with a lower index of refraction, like air. If the ray of light is moving from the less dense medium (lower index of refraction), to a more dense (higher index of refraction) the ray of light bends TOWARDS the normal.
Each substance has an index of refraction. The index of refraction of water is about 1.3330 . The index of refraction of air at standard conditions is about 1.0003 . There is no such thing as the index of refraction of "water to air".
Use the definition of "index of refraction". In this case, you simply need to divide the speed of light in a vacuum by the index of refraction.
200
well kids, the answer is INDEX OF REFRACTION. (: science question on my homework
c divided by the index of refraction of the medium = the speed of light in the medium.
Water's index of refraction is 1.333
Use the definition of "index of refraction". In this case, you simply need to divide the speed of light in a vacuum by the index of refraction.
Approximately 1