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Snell's Law Calculator
( Refractive Index Calculator)

Refraction Indices of 1st Medium:
Angle of Incidence:
Refraction Indices of 2nd Medium:
Angle of Transmission:
     


Snell's law describes a ray refracts at an interface between materials. Snell's Law formula:
  n1sinθ1 = n2sinθ2

where:

  n1: Indices of refraction of Medium 1, dimensionless
  θ: Angle of incidence, in radian
  n2: Indices of refraction of Medium 2, dimensionless
  θ: Angle of transimission, in radian



Refractive Index Chart of Common Materials:

Material Condition Refractive Index
Vacuum 1 (per definition)
Air at standard atmosphere 1.000277
Air Gas at 0 ̊C, 1 atmosphere 1.000293
Helium Gas at 0 ̊C, 1 atmosphere 1.000036
Hydrogen Gas at 0 ̊C, 1 atmosphere 1.000132
"Carbon dioxide" Gas at 0 ̊C, 1 atmosphere 1.00045
Benzene Liquid at 20 ̊C 1.501
Carbon disulfide Liquid at 20 ̊C 1.628
Carbon tetrachloride Liquid at 20 ̊C 1.461
Ethanol Liquid at 20 ̊C 1.361
Silicone oil Liquid at 20 ̊C 1.52045
Water Liquid at 20 ̊C 1.3330
Titanium dioxide Solid at room temperature 2.496
Diamond Solid at room temperature 2.419
Strontium titanate Solid at room temperature 2.41
Amber Solid at room temperature 1.55
Fused silica Solid at room temperature 1.458
Sodium chloride Solid at room temperature 1.50
Water ice 1.31
Cornea (human) 1.3375
Cryolite 1.338
Acetone 1.36
Ethanol 1.36
Polytetrafluoroethylene 1.35 - 1.38
Lens (anatomy) (human) 1.386 - 1.406
Sylgard 184 1.43
Pyrex 1.470
Glycerol 1.4729
Acrylic glass 1.490 - 1.492
Halite 1.516
Crown glass (optics) 1.50 - 1.54
Polycarbonate 1.584 - 1.586
Poly(methyl methacrylate) 1.4893 - 1.4899
PETg 1.57
Polyethylene terephthalate (PET) 1.5750
Flint glass (pure) 1.60 - 1.62
Crown glass (impure) 1.485 - 1.755
Bromine 1.661
Sapphire 1.762 - 1.778
Flint glass (impure) 1.523 - 1.925
Cubic zirconia 2.15 - 2.18
Potassium Niobate (KNbO3) 2.28
Moissanite 2.65 - 2.69
Cinnabar (Mercury sulfide) 3.02
Gallium(III) phosphide 3.5
Gallium(III) arsenide 3.927
Zinc Oxide 2.4
Silicon 4.01