can somebody tell me how can i prepare a night vision scope in home.what materials will be needed & how it will be prepared?on what principle does night vision binocular works?

night vision devices have components which detect body heat. They sense infrared light. So you would infrared detectors. And lens/mirrors in the infrared region.

The Penal Code refers to a night vision rifle scope as a "sniper scope", and the restrictions regarding possession and use are outlined in section 468. I understand that as currently applied, only the military (like the state has any authority over them anyway) law enforcement or people doing legitimate, verifiable educational research can possess a night vision rifle scope. Simply owning one is considered illegal. It is also my understanding that it need not be designed to be a sighting device, but only that you have the means to attach it to a firearm. You can read the code section by following the link below.

Say i have night vision goggles. Can i look through a non night vision rifle scope with my goggles on and see a magnified image in night vision?

Ive seen it happen with video cameras. a guy put his night vision over his video camera and recorded in night vision. however he was in the military and was using high quality night vision.

Also what generation would you suggest for hunting? 1? 2?
i can only really afford 1 or 2.

Yes it has been done but remember a camera especially newer digital ones have a wider spectrum of vision than the naked eye and if you are serious about hunting or using a rifle in the dark you really should consider using a proper night vision scope.
If you try to improvise by using night goggles with an existing scope at night you run into all sorts of issues, judging distances inaccurately being one of them which in turn could be a hindrance on your personal safety not to mention others.

Make sure you use the correct tool for the job it just makes sense that way. There are many manufacturers that make night vision hunting scopes in all prices ranges.

ATN, Tasco, Bushnell, Yukon and Nightowl are all worth checking out.

Good Luck