# Relationship between refractive index and optical density to light

### How does optical density relate to mass density and refractive index? | Physics Forums What is the difference between optical density and refraction? Optical index is how slow light goes through the medium (and hence how bent a ray will be);. Optical density is a term used in the field of optical spectroscopy for It is calculated as the logarithmic ratio of the intensity of radiation The dimensionless refractive index value indicates the number of times slower a light . my textbook says that optical density is the ratio of the speed of light in the two media. another textbook says refractive index is the ratio of.

I believe the term is also sometimes used to describe the refractive index, but I think is a bad thing to do as it can easily lead to confusion. Refractive index is well-defined and says everything necessary about the refraction of light. Very different, from an initial-perception point of view. Optical index is how slow light goes through the medium and hence how bent a ray will be ; Optical density is how darkening the medium is to light passing through. I often wish I could use the phrase "optical density" meaning "index of refraction". It seems a logical construction of English scientific language, and it fits in some sentences a little better. But I guess it is taken. When you see "optical density", think: How dense is the "dark smoke" in that smoky quartz?

## Optical Density and Light Speed

Optical density number-scale takes a little getting used-to. The refractive index and refractive power are both directly proportional because due to power the distance is decrease or increase if power increases or decreases and to r…efractive index the bending of light occurs in towards or away. Bending of light ray and distance of light ray are directly proportional so refractive index and power are directly proportional.

They have very little connection, except that the same big word appears in both terms. Refractive index of a substance is the ratio of the speed of light in vacuum to the speed of light in that substance. Refractive power of an optical device, like a lens, does naturally depend somewhat on the refractive index of the material used to make the lens, but it's got much more to do with the shape of the lens You can make lenses with a wide range of different refractive powers, all out of the same kind of glass with the same refractive index.

And you can construct lenses that all have the same refractive power out of many many different substances with different refractive indexes, like crown glass, flint glass, plastic, jello etc. So in that sense, the two are completely unrelated. What is the relationship between a refraction and an optical illusion? Refraction has to do with the curvature of light because the indexof refraction. Optical illusions are when you see things thatnormally you wouldn't. Of course, I wouldn't con…sider an opticalillusion to be the results of brain damage, but rather of theintact brain.

The relation between the angle of refraction and refactive index is: There is no relation between refractive index and viscosity asviscosity is just the flow of electrons. In Unit 10 of The Physics Classroom Tutorialthe particle-to-particle interaction mechanism by which a mechanical wave transports energy was discussed in detail. In Unit 12 of The Physics Classroom Tutorialthe mechanism of energy transport by an electromagnetic wave was briefly discussed.

### Optical Density and Light Speed

Here we will look at this method in more detail. An electromagnetic wave i.

• MODERATORS
• How does optical density relate to mass density and refractive index?

This value is the speed of light in a vacuum. When the wave impinges upon a particle of matter, the energy is absorbed and sets electrons within the atoms into vibrational motion.

If the frequency of the electromagnetic wave does not match the resonant frequency of vibration of the electronthen the energy is reemitted in the form of an electromagnetic wave.

This new electromagnetic wave has the same frequency as the original wave and it too will travel at a speed of c through the empty space between atoms. The newly emitted light wave continues to move through the interatomic space until it impinges upon a neighboring particle. The energy is absorbed by this new particle and sets the electrons of its atoms into vibration motion.