LASERs make almost anything better, and that includes refracting light in physics lessons.  Here's a guide to refracting LASER light, and some calculations you might need to do afterwards.

Step 1: Just a bit on theory

As a beam of light enters an optically more dense medium it slows down.  If a beam of light is traveling diagonally, some parts will slow down before others. This causes the light ray to bend towards the normal (the normal is a line drawn perpendicular to the surface where the beam of light hits).  The opposite happens when a light ray leave a more dense medium.
cool! this reminds me of a demo I saw at the smithsonian that was showing how different types of telescopes work. kind of like <a href="http://www.ayton.id.au/gary/Science/Astronomy/Ast_Telescope_Types.htm">this</a>.
YES! Lasers make math more fun. Cool project. Hope you can find a camera that allows you to take better photos in the dimness required for laser-visibility.
Yeah, I know about the camera, all the pictures were actually taken at school for a guide we're supposed to make (this is it). Unfortunately, i don't have a LASER.

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