transmissivity is equal to one for which body?

please explain

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  • The fraction of radiation transmitted is called the transmissivity τ.
    Transmissivity = (transmitted radiattion/incident radiation).
    The sum of the absorbed, reflected, and transmitted radiation energy be equal to the incident radiation. That is,
    Gabs + Gref + Gtr = G
    Dividing each term of this relation by G yields
    α+ρ+τ=1
    For Black body, α=0, ρ=0 and thus
    T=1
    0
  • Black body
    0
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