GCSE Physics


Rotate a 45-90-45° prism so that light enters it through its longest side and two internal reflections occur:

reflection of ray of light through 180 degrees by 45-90-45 prism

In this way the prism will reflect light back to where it came from. Now imagine lots of these triangular prisms being made out of clear red plastic...

GCSE PhysicsWaves Menu GCSE PhysicsGo to next page