What scientists call “light” isn't just what we will see, but all electromagnetic radiation – from low-frequency radio waves to excessive-frequency X-rays.
commonly, light actions thru a fabric at a slower velocity. as an example, visible light travels via glass about 33 percentage slower than it does thru air. a fabric’s essential resistance to the transmission of mild at a selected frequency is known as its “index of refraction.” even as this variety changes with the light’s frequency, it starts at 1 – the index of refraction for a vacuum – and goes up. The higher the index, the slower the mild movements, and the more its route bends. this will be visible when searching at a straw in a cup of water and is the idea of how we make lenses for eyeglasses, telescopes and different optics.
Scientists have lengthy puzzled if they could make a fabric with a poor index of refraction at any given frequency. that could suggest, for example, that mild could bend in the opposite route while coming into the material taking into account new styles of lenses to be made. nothing in nature fits into this category. The residences of such a fabric – were it to exist – were anticipated with the aid of Victor Veselago in 1967.
these abnormal substances have residences that appearance very unusual as compared with our everyday reports. within the picture underneath, we see two cups of water, each with a straw in it. The picture on the left is what takes place commonly – the phase of the straw within the water seems disconnected from the part of the straw this is within the air. The photo is displaced because air and water refract light in a different way.
The image on the right indicates what the straw might appear like if the fluid were a cloth with a negative index of refraction. for the reason that light bends within the opposite direction, the photo is reversed, growing the found illusion.
even as Veselago should consider those materials in the late Nineteen Sixties, he could not conceive of a way to create them. It took an extra 30 years before John Pendry published papers in 1996, 1998 and 1999 describing a way to make a composite man-made material, which he called a metamaterial.