Is invisibility really achieved?

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Invisibility through the bending of light is theoretically possible using meta-materials with refraction indices less than 1, which can create a sphere that conceals objects within. While such meta-materials exist, they currently require impractical conditions for real-world application. No one has successfully built a functional invisibility cloak yet, but research shows potential for future advancements. The concept remains largely theoretical, and practical solutions are still far from realization. Overall, achieving true invisibility is still a significant challenge in the field of optics.
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Is invisibility really achieved?

are we really able to bend lighth or its still a myth?
 
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Have a glass of water handy?
 


There are solutions for a sphere that bends light in a way that it appears to not be there at all and remains invisible when viewed from any direction. It has a hollow center where an ordinary object may be concealed. These solutions require meta-materials with refraction indices less than 1. Such meta-materials do exist, but currently, require some very special conditions that make them impractical for building something out of.

I have not heard about anyone actually building one of these, but things look promising at least. However, something even remotely resembling a practical invisibility cloak is still a long way away.
 


You seem to have spilled your jar of question marks.
 

Thread 'Why can't Solar panels be hemispherical, or a curved strip type?'

comparing a flat solar panel of area 2π r² and a hemisphere of the same area, the hemispherical solar panel would only occupy the area π r² of while the flat panel would occupy an entire 2π r² of land. wouldn't the hemispherical version have the same area of panel exposed to the sun, occupy less land space and can therefore increase the number of panels one land can have fitted? this would increase the power output proportionally as well. when I searched it up I wasn't satisfied with...
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