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Listed under:  Science  >  Forces and energy  >  Waves (Energy)  >  Wavelength
Video

How do prisms create rainbows?

Zoom inside a glass prism and see why glass makes light bend, and how the glass molecules make different colours of light bend different amounts.

Video

Can photons and atoms generate laser?

Electrons around atoms can absorb and emit photons of particular colours of light – see three different atomic models explain what's going on.