1688. The interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emis-sivities εx & εy is given by

Εx + εy
Εx . εy
1/εx + 1/εy
(εx + εy)/(εx + εy – εx . εy)
✅ The correct answer is option D.

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