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For infinite parallel planes with emissivities $$\epsilon_1 and \epsilon_2,$$ the interchange factor for radiation from surface 1 to surface 2 is given by
$$\frac {\epsilon_1 \epsilon_2}{\epsilon_1 + \epsilon_2 - \epsilon_1 \epsilon_2}$$
$$\frac{1}{\epsilon_1} + \frac {1}{\epsilon_2}$$
$$\epsilon_1 + \epsilon_2$$
$$\epsilon_1 \epsilon_2$$
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