Q. 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
| (A) 0.0625 | (B) 0.25 |
| (C) 0.5 | (D) 1.0 |
Ans: 1.0
Sol:
By summation rule
F1-1 + F1-2 = 1
∵ F1-1 = 0 because no radiation leaving the surface 1 will strike the surface 1.
∴ F1-2 = 1
![Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Determine-the-correctness-or-otherwise-of-the-following-Assertion-A-and-the-Reason-R.jpg)
