Dear

I heard that now in modern technology the light can be reflect at such angle that we can see the objects even behing the wall.Is it true. Please help me out

Erm, what?

You might be interested in:

Mirror - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Mirror)
Periscope - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Periscope)

It seems to me like you a describing a mirror, but that's not very high tech.

Do you mean the camera that can see through walls? That kind of stuff doesn't capture a direct image, but sends out ultrawideband signals that relay information back to the machine, making a picture of what is behind the wall. If light could pass through opaque objects like walls, I think we would be able to see it.