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In Wave Mechanics , the spatial frequency
u \ is related to the wavelength \lambda \ by

:
u \ = \ { 1 \over \lambda }

Likewise, the Wave Number ''k'' is related to spatial frequency and wavelength by

: k \ = \ 2 \pi
u \ = \ { 2 \pi \over \lambda }


Visual perception

In the study of Visual Perception , Sinusoidal Gratings are frequently used to probe the capabilities of the visual system. In these stimuli, spatial frequency is expressed as the number of Cycles per Degree of Visual Angle .