Metamaterial prism creates a reverse rainbow

(Phys.org)—In a normal rainbow, red is always on "top" while violet is on the "bottom." This is true whether the rainbow is created by a glass prism or by water droplets in the sky, and is due to the way that these materials ...

Forging a photo is easy, but how do you spot a fake?

Faking photographs is not a new phenomenon. The Cottingley Fairies seemed convincing to some in 1917, just as the images recently broadcast on Russian television, purporting to be satellite images showing the MH17 airliner ...

Novel zoom objective with deformable mirrors

Unmanned aerial vehicles UAVs deployed on landscape analysis missions carry optical measuring equipment that is required to operate free of chromatic aberration. Researchers have now designed an all-reflective zoom objective ...

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