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I've introduced the theory of light and how it travels in straight lines to my KS3 students. Used the light boxes to show the angle of incident and angle of reflection. They soon understood the concepts of incident ray and reflection ray.
The students drew diagrams of their apparatus and labelled them. It was a great lesson and we ended up looking at prisms and rainbows which they thought were 'cool' as we projected them on the far wall of the laboratory.
