RefractiveIndex.INFO
Refractive index database
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Option: 19.0 °C
20.0 °C
21.5 °C
24.0 °C
SOPRA N&K Database
Wavelength: µm   (0.182~1.129)
unit converter
Refractive index and related constants - Water, H2O
Refractive index at 0.5876 µm

Refractive index - Wikipedia

n = 1.3334

dn/dλ at 0.5876 µm

dn/dλ = -0.0313 µm-1

Abbe numbers

Abbe number - Wikipedia

Vd = 55.76

Ve = 55.82

Formulae    Abbe diagram
Chromatic dispersion curve

Dispersion (optics) - Wikipedia

[ Figure: Refractive index of $plain_material_name ]
Dispersion formula

Sellmeier equation - Wikipedia

n2 - 1 = C1λ2/(λ2-C2) + C3λ2/(λ2-C4) + C5λ2/(λ2-C6) + C7λ2/(λ2-C8)

C1 = 5.684027565E-1; C2 = 5.101829712E-3; C3 = 1.726177391E-1; C4 = 1.821153936E-2; C5 = 2.086189578E-2; C6 = 2.620722293E-2; C7 = 1.130748688E-1; C8 = 1.069792721E1

C

n = sqrt( 1 + 5.684027565E-1*pow(x,2)/(pow(x,2)-5.101829712E-3) + 1.726177391E-1*pow(x,2)/(pow(x,2)-1.821153936E-2) + 2.086189578E-2*pow(x,2)/(pow(x,2)-2.620722293E-2) + 1.130748688E-1*pow(x,2)/(pow(x,2)-1.069792721E1) );

Fortran

n = SQRT( 1 + 5.684027565E-1*x**2/(x**2-5.101829712E-3) + 1.726177391E-1*x**2/(x**2-1.821153936E-2) + 2.086189578E-2*x**2/(x**2-2.620722293E-2) + 1.130748688E-1*x**2/(x**2-1.069792721E1) )

Visual Basic

n = SQR( 1 + 5.684027565E-1*x^2/(x^2-5.101829712E-3) + 1.726177391E-1*x^2/(x^2-1.821153936E-2) + 2.086189578E-2*x^2/(x^2-2.620722293E-2) + 1.130748688E-1*x^2/(x^2-1.069792721E1) )

Expressions for n

Reflection and related optical constants - Water, H2O

Angle of incidence (0~90°): 

Direction: in out

Conditions

20.0 °C

Source of refractive index data

M. Daimon and A. Masumura. Measurement of the refractive index of distilled water from the near-infrared region to the ultraviolet region, Appl. Opt. 46, 3811-3820 (2007) [doi:10.1364/AO.46.003811]

Comments

High performance liquid chromatography (HPLC) distilled water. Refractive index is absolute (relative to vacuum). Wavelength is vacuum wavelength.

Links

Water (molecule) - Wikipedia