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

Ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)

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

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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