A rainbow reveals with colors what otherwise remains hidden: light is "refracted" by transparent matter, in this case water ...

When it comes to light, certain types of fabricated materials behave in a radically different manner from ordinary materials like water and glass: they have negative refractive indices, so that light ...

There has been a surprise discovery of ‘significant’ refraction of gamma rays which opens the door to nuclear photonics and the use of high energetic light beams to investigate the atomic nucleus.