The first powerpoint uses rays travelling from glass into air and from water into air to illustrate TIR. Includes critical angle and critical ray. As an example of a use of TIR there is also a slide showing how light totally internally reflects along an optical fibre and illustrates the need for cladding glass.
The second powerpoint shows how you can find the critical angle using a semicircular glass block and gives the two conditions necessary for TIR to occur.
The third powerpoint is meant to reinforce the concept of TIR. It shows how 45 degree prisms can be used to turn a light ray through 90 degrees and through 180 degrees. A non-45 degree prism is used to further reinforce the concept of TIR.
Rays are drawn in stages to show all the steps in constructing an accurate ray diagram.
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