Subject: What is a Negative Shadow?

Greetings,
In a TV program discussing the Strategic Defense Initiative, the 
concept of negative shadow was mentioned as one mean to hit 
enemy missiles. According to this program, unlike ordinary 
("positive") shadow, a body shaded by a negative shadow actually 
recieves MORE light. Yet no explanation was given to this odd 
phenomenon.
SO, what is negative shadow? How is it produced? Are there any 
existing applications of it?

Thanks in advance,
Lior Golgher.

Re: What is a Negative Shadow?