Ray Optics Box :- Black finish box, with 12V 24W straight filament lamp. The lamp holder, with 1 meter of twin flex wire, is mounted in sliding bridge piece which provides sufficient adjustment for covering, parallel or diverging rays. The body has slots to support a cylindrical lens & a triple slit screen. Extra slots are provided for filters. The box is supplied complete with lamp & triple slit but without lenses or filters.
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