Invisible man.....

Yesterday i read an article in Indian Express abt the research to make things invisible.I guess there are the following ways to do that..
1)To make the refractive index of the body and that of the surrounding almost same....in this case refraction or reflection wont happen and hence the body will be almost invisible..
Examples are many aquatic life forms like jelly fish etc. Also glass ball in water might be another example
2)Another way is to camouflage the body according to the surroundings.This idea has been used in one James Bond movie.U can get the image behind the body and then display it on the body to be made invisible.
3)The third way is what is mentioned in the paper.. That is make the light bend around u. This is very intuitive...It is as if u arent present there...the light from the bodies behind u also follow the curved path around u and hence there arent any issues...The research guys it seem have come close to making this practical.

But there are a few issues with this invisiblity thing...
If u cant be seen, then it is as simple as u cant see!!!
Let me explain,All the almost invisible aquatic organisms have very black beady eyes.The reason is that for vision, u have to focus light and hence a difference in refractive index is a must...Hence the closer u try to reach to invisibility...the close u move towards blindness..
Even in the case where our researchers are bending the light around u, they are effectively making it impossible for light from things reach ur eyes...effectively blinding u...

It seems that HG Wells was also aware of this fallacy when he wrote Invisible man...but be put this aside to create his story...The actual invisible man according to HG Wells would have been a blind man seen by none!! Pathetic situation...

One work around is :

U can be invisible only in a particular spectrum..something like our Mr India...who can be seen in red light :)...
In this case only a particular spectrum of light is bent around u...or the refractive index wrt to a particular range matches the surrounding...

The guys in the Predator movie seem to have thought abt this...they have made the alien invisible and also have made his vision primitive...something like a night vision in infra red light...