but                   (σ)_{black body} = 1   and      (e)_{black body} = E   (say)

Then,              (e/a)_{for any surface} = Constant = E

Similarly for a particular wavelength λ,       (e_λ/a_λ)_{for any body} = E_λ   

Here                E = emissive power of black body at temperature T = σT⁴

From the above relation, we can take that

                        e_λ ∝ a_λ

i.e., good absorbers for a particular wavelength are also good emitters of the similar type of wavelength.

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