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| Ray Track apparatus
(SI-PH-1153) |
| Ray track apparatus consist of a wooden board 40x28x1.2cm with white matt surface, carrying a circular scale divided in to four quadrants each 0-90o graduated are very 2o a removable turntable 17cm diameter with two lines at right angles and a ray box No JSS 260. Slots in the ray box can accommodate metal slits, colours filters, lenses etc. The ray box is fitted with a 12 volts lamp. Supplied complete with on cylindrical biconvex lens; focal Length 75mm and two double and triple slits, one side being whitened for use as a return image screen |
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