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‡ This article summarizes a more detailed report included in the Elevperspektiv (The Pupil's Perspective) series. This report, ‘Light and its properties’, is available in both Swedish and English, and describes answers to a greater number of problems than are mentioned in the present article. In addition, interviews with 21 pupils are analysed and illustrated with examples. The report can be obtained from Bjorn Andersson, EKNA Project, Department of Educational Research, PO Box 1010, S‐431 26 Molndal, Sweden.
Andersson et al. (Sat,) studied this question.
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