For infinite parallel planes having emis-sivities Œµ1 & Œµ2, the interchange factor for radiation from surface 1 to surface 2 is given by$

Œµ1.Œµ2/(Œµ1 + Œµ2 - Œµ1.Œµ2)

For infinite parallel planes having emis-sivities Œµ1 & Œµ2, the i

1.	For infinite parallel planes having emis-sivities Œµ1 & Œµ2, the interchange factor for radiation from surface 1 to surface 2 is given by$
A.	(Œµ1 + Œµ2)/Œµ1.Œµ2
B.	Œµ1.Œµ2/(Œµ1 + Œµ2 - Œµ1.Œµ2)
C.	Œµ1.Œµ2
D.	Œµ1 + Œµ2
Answer» C. Œµ1.Œµ2

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For infinite parallel planes having emis-sivities Œµ1 & Œµ2, the interchange factor for radiation from surface 1 to surface 2 is given by$

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