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Lecture demonstrations for a Saturday morning. First - a rainbow. Very simple with a projector, card and a flask. Methyl Cinnimate is better than water for doing this as it has a higher refractive index. 
And complementing a rainbow is the classic dispersion of white light in a prism demo - colors seem to have saturated on the card but not on the reflection on the table.
Speaking of colour, very simple yet amazingly effective is to use a hand-held RGB colour mixer
