Skip to main content
`Ctrl`+`K`
scipy.constants.

# lambda2nu

scipy.constants.lambda2nu(lambda_)

  Convert wavelength to optical frequency

  Parameters:
    lambda_array_like

      Wavelength(s) to be converted.

  Returns:
    nu float or array of floats

      Equivalent optical frequency.

  Notes

  Computes `nu = c / lambda` where c = 299792458.0, i.e., the (vacuum) speed of light in meters/second.

  Examples

      >>> from scipy.constants import lambda2nu, speed_of_light
      >>> import numpy as np
      >>> lambda2nu(np.array((1, speed_of_light)))
      array([  2.99792458e+08,   1.00000000e+00])