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For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?

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For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?

A. (ε1 + ε2)/ε1.ε2
B. ε1.ε2/(ε1 + ε2 – ε1.ε2)
C. ε1.ε2
D. ε1 + ε2