For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

For infinite parallel planes having emis-sivities ε1 & ε2, the inter

1.	For infinite parallel planes having emis-sivities 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
Answer» C. ε1.ε2

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For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

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