Sentences with phrase «known magnifying lenses»
One of the most powerful known magnifying lenses isn't found on Earth.
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However, through the phenomenon known as «gravitational lensing,» a massive, foreground cluster of galaxies acts as a natural «zoom lens» in space by magnifying and stretching images of far more distant background galaxies.
If you've ever used a magnifying glass to start a fire, you know that sending light through a lens can focus it into a point.