Sphere 1 with a diameter of 0.1 m is completely enclosed

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Sphere 1 with a diameter of 0.1 m is completely enclosed by another sphere 2 of diameter 0.4 m. The view factor F₁₂ is

1. 0.0625
2. 0.25
3. 0.5
4. 1.0

Correct Option: D

F₁₁ = 0
F₁₂ = 1