Refractive Index

This is the ratio of the velocity of light in free space to that in the material.

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Acetaldehyde 1.3311 at 589.3nm 101.3kPa 0CClip Acetic Acid 1.3718 at 589.3nm 101.3kPa 0CClip Acetic Anhydride 1.3904 at 589.3nm 101.3kPa 0CClip
Acetone 1.362 at 589.3nm 101.3kPa 0CClip Acetonitrile 1.3415 at 298K at 589.3nm 101.3kPa 0CClip Acetophenone 1.53423 at 589.3nm 101.3kPa 0CClip
Acetyl Chloride 1.3898 at 589.3nm 101.3kPa 0CClip Allyl Alcohol 1.4135 at 589.3nm 101.3kPa 0CClip Ammonium Hydrogenphosphate 1.52 at 589.3nm 101.3kPa 0CClip
Aniline 1.5862 at 589.3nm 101.3kPa 0CClip Anisole 1.517 at 589.3nm 101.3kPa 0CClip Argon 1.000281 at 589.3nm 101.3kPa 0CClip
Benzene 1.5011 at 589.3nm 101.3kPa 0CClip Bromine 1.001132 at 589.3nm 101.3kPa 0CClip Carbon 2.417 diamond at 589.3nm 101.3kPa 0CClip
Carbon Disulphide 1.6276 at 589.3nm 101.3kPa 0CClip Carbon Tetrachloride 1.4607 at 589.3nm 101.3kPa 0CClip Chlorine 1.000773 at 589.3nm 101.3kPa 0CClip
Chloroform 1.4467 at 589.3nm 101.3kPa 0CClip Diamond 2.4175 to 2.4178 at 589.3nm 101.3kPa 0CClip Fused Silica 1.458 at 589.3nm 101.3kPa 0CClip
Glycerol 1.473 at 589.3nm 101.3kPa 0CClip Helium 1.000036 at 589.3nm 101.3kPa 0CClip Hydrogen 1.000132 at 589.3nm 101.3kPa 0CClip
Mercury Hg 1.73 at 589.3nm 101.3kPa 0CClip Methyl Alcohol 1.3276 at 589.3nm 101.3kPa 0CClip Nitrobenzene 1.553 at 589.3nm 101.3kPa 0CClip
Nitrogen 1.000297 at 589.3nm 101.3kPa 0CClip Olive Oil 1.48 at 589.3nm 101.3kPa 0CClip Oxygen 1.001711 at 589.3nm 101.3kPa 0CClip
Paraffin Oil 1.43 at 589.3nm 101.3kPa 0CClip Phenol 1.5425 at 589.3nm 101.3kPa 0CClip Sea Water 1.343 at 589.3nm 101.3kPa 0CClip
Silicon Nitride 2.016 at 589.3nm 101.3kPa 0CClip Silver Nitrate 1.744 at 589.3nm 101.3kPa 0CClip Sodium Chloride 1.544 at 589.3nm 101.3kPa 0CClip
Sodium Silicate 1.52 at 589.3nm 101.3kPa 0CClip Toluene 1.4969 at 589.3nm 101.3kPa 0CClip Turpentine 1.48 at 589.3nm 101.3kPa 0CClip
Water 1.333 at 589.3nm 101.3kPa 0CClip<
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Measurement of Refractive Index
Using a short focus travelling microscope, focus on a mark on a white surface.
Microscope set to focus on mark on surface. Distance recorded as Z1.

Place the material to be measured over the mark and re-focus on the image of the mark.

Microscope set to focus on image of the mark on surface. Distance recorded as Z2.

Then place a mark on the top surface of the material (eg use lycopodium powder) and focus on this.

Microscope set to focus on top surface of the material. Distance recorded as Z3.

The refractive index, n is then calculated using these recorded distances:

See also: Abbe Number, Abbe Refractometer, Refraction, Total Internal Reflection.

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