Web EndMemo

Snell's Law Calculator
( Refractive Index Calculator)

 Refraction Indices of 1st Medium: Angle of Incidence: degree radian mil sign second minute gon Refraction Indices of 2nd Medium: Angle of Transmission: degree radian mil sign second minute gon

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