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A lens is used to focus light. Lenses do this by refraction. Laboratory experiments with lightIn the laboratory you will use a ray box to produce three parallel rays to do your light experiments with. Diagrams you have to draw in examinations often refer to the results of these experiments.
Rays from an object at infinity travel parallel to each other - therefore using a close-up light source that produces parallel beams of light is useful in the laboratory. Those beams act in the same way as rays coming from an object a long way away - like the Sun. ----------------------------------------------------------------------------
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Why does a ray box produce three parallel beams of light?
