Consider the following statements.
1) Umbra is a shadow of total darkness.
2) Penumbra is a shadow of partial darkness.
3) An extended source in general, produces umbra as well as penumbra.
a) 1, 2 only
b) 2, 3 only
c) 1, 2, 3
d) 1, 3 only
Answer: c) 1, 2, 3
