Ask your own question, for FREE!
Physics 21 Online
OpenStudy (kmazraee):

why there is not a sharp boundary between shadow and Penumbra? and between Penumbra and light zone? is there a mathematical prove?

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!