A team at Harvard University have build a lens that’s thinner than the waves of light it focuses. Based on light-warping metamaterials, this lens may one day replace the heavier glass lenses found in items like microscopes, smartphones, cameras and even telescopes.
Lens technology has come a very long way since those early days, but it’s still difficult to build very compact lenses. If you’ve ever wondered why your phone’s camera lens sticks slightly proud of the back, this is why.
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