Class Clips is changing
We will be introducing the new Knowledge and Learning Beta website over the coming months. Clips for use in the classroom are now available on your phone, tablet or PC.

Alternatively, you can still browse or search by keyword or clip number on this site.

CLIP 13525



Did you know?

All Class Clips content is available to watch on mobile, tablet and desktop devices on our new Knowledge & Learning BETA website.

Key Info
  • Refraction
  • Science presenter Jon Chase practically demonstrates refraction by placing the handle of a Pyrex jug into vegetable oil to make it seemingly disappear. The definition of refraction is then given. Footage of refraction is seen, including a ray of light passing into and out of a glass block. The adjustment (because of refraction) made by birds hunting fish in water is described. A full description of why the Pyrex handle seems to disappear is then given.
  • Subject:



    Phys: Waves - Sound and Light

  • Keywords: refraction, refractive index, Pyrex, vegetable oil, BitesizeScience
Ideas for use in class
  • Students can investigate refraction using ray boxes and blocks of Perspex or glass. The demonstration can be repeated using vegetable oil and Pyrex, including laboratory glassware. It is most impressive when repeated using a very large beaker and a smaller beaker. Search online for ‘water beads’ to purchase low cost hydrogel polymer beads which absorb a lot of water and swell up into larger colourless spheres which have the same refractive index and water, so appear invisible when immersed. Students will be able to dip their hand into the water and feel them, but not see them.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

BBC navigation

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.