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Massachusetts Institute of Technology (MIT) engineers have manufactured a novel "metalens" that can shift focus at multiple depths without tilting or moving. Contrary to usual lenses, this one is not made of solid glass, but rather of a transparent "phase-changing" material.

As described in the newly published study in the journal Nature Communications, once the material is heated, it can rearrange its atomic structure and change the way it interacts with light. This enables the metalens to shift its focus without needing bulky mechanical components. 

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