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An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by

An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by Correct Answer $$\frac{{{{\text{e}}_1}{{\text{e}}_2}}}{{{{\text{e}}_1} + {{\text{e}}_2} - {{\text{e}}_1}{{\text{e}}_2}}}$$

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