Abstract
Two teaching methods, expository and guided discovery, were used to present physics tasks to a random sample of 120 secondary school, class three students (approximately 14‐year olds). The students were tested before the experiment, properly equated and then exposed to a four‐week unit on optics (which comprised light as a form of energy, reflection of light on plane and curved surfaces, and related problems on reflection of light). Analysis of post‐test scores showed that the guided discovery approach produced significantly higher gains (p < 005) in achievement over the expository approach.

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