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Light source in metal housing on magnetic foil for experiments
demonstrating ray optics on a whiteboard. Experiments on reflection,
refraction, and basic lens laws can be performed using five narrow light
rays emerging from the right-side. With the help of rotating mirrors,
these rays can be directed to make parallel, divergent, or convergent
beams; the beams can be masked out individually. Demonstrations on
shadow casting can be conducted using the two divergent light rays
emerging from the left-hand side. With the help of rotating mirrors,
these rays can be directed or masked out individually.