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For infinite parallel planes having emis-sivities $${{\varepsilon _1}}$$ & $${{\varepsilon _2}}$$, the interchange factor for radiation from surface 1 to surface 2 is given by

For infinite parallel planes having emis-sivities $${{\varepsilon _1}}$$ & $${{\varepsilon _2}}$$, the interchange factor for radiation from surface 1 to surface 2 is given by Correct Answer $$\frac{{{\varepsilon _1}.{\varepsilon _2}}}{{{\varepsilon _1} + {\varepsilon _2} - {\varepsilon _1}.{\varepsilon _2}}}$$

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