Abstract
To overcome students’ inaccurate prior knowledge on primary additive colours, acoloured-light mixer has been constructed to enable students to observe directly the coloursproduced and reach the conclusion by themselves that the three primary colours of light arered, green, and blue (NOT red, yellow, and blue). Three closely packed tiny light-emittingdiodes (LEDs) producing primary colours are combined with green intensity varyingcircuitry to generate the standard colour-triangle secondary colours and various shadesranging from yellow to orange and pale blue to cyan. In the laboratory, students workedcollaboratively, predicting, observing and explaining, and finally discussing until there wasa consensus.
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