<Li> Spatial frequency is analogous to temporal frequency, but the time axis is replaced by one or more spatial displacement axes . E.g.: </Li> <Dl> <Dd> <Dl> <Dd> y (t) = sin ⁡ (θ (t, x)) = sin ⁡ (ω t + k x) (\ displaystyle y (t) = \ sin \ left (\ theta (t, x) \ right) = \ sin (\ omega t + kx)) </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> y (t) = sin ⁡ (θ (t, x)) = sin ⁡ (ω t + k x) (\ displaystyle y (t) = \ sin \ left (\ theta (t, x) \ right) = \ sin (\ omega t + kx)) </Dd> </Dl> </Dd> <Dl> <Dd> y (t) = sin ⁡ (θ (t, x)) = sin ⁡ (ω t + k x) (\ displaystyle y (t) = \ sin \ left (\ theta (t, x) \ right) = \ sin (\ omega t + kx)) </Dd> </Dl>

One difference between violet light and red light is that