c = speed of light (3.00E8 m/s or 3.00E8 m*Hz)
f = frequency of light as Hz or 1/s where 1 1/s = 1 Hz
λ, lamda (symbol: backwards h, see in example calculations) is wavelength (m or nm)
The components are related by the following:
Equation: c = f * λ
Here is a picture of the two different waves:
So you can see from the picture above, that the frequency and the wavelength are inversely (indirectly) proportional to each other (as one goes up other goes down)