The movie, Death Note Part 2, The Last Name?

Question

I need to find out how does Misa know that Light is Kira, when she is coming down the stairs from her room when her show was cancelled. Afterwhich, Light also asked her and Ryuk shurgged and say that Light did not ask.
I missed his explaination then. Anyone can fill in my query? Thanx. Can't sleep over this...

Answer 1

Misa's Shinigami eyes could see the name and lifespan of a person..., but when she was look at Light, she could not see his lifespan so she determine that Light is Kira.

Answer 2

i never saw the movie, but in the manga she knows light is kira, bc she has the death god eyes and she can see everybodys name when she sees their face, but she cannot see a human who has a death note's lifespan. In other words she saw his name, but not his lifespan, thus proving that he had a death note.

Hope This Info helps u get some shut eye!