Andrew Norton shows what happens when waves pass through apertures of different sizes.

Exploring wave motion - for iPod/iPhone

Apertures and diffraction

What are waves and what happens to them when they pass through a gap? Do different sorts of waves behave in the same way? Dr Andrew Norton of The Open University uses a ripple tank to demonstrate some of the key features of wave motion, and show how waves spread out when they pass through an aperture. Using a laser and a diffraction grating, he shows that light waves spread out in the same way. The album draws on material originally created to support The Open University course Exploring Science.

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Exploring wave motion - for iPod/iPhone