Wood board with matt white surfaces, mounted on plastic feet carries a circular scale with 0-360°, four quadrants 0- 90° graduated every 2° , removable turntable 170mm dia with 2 lines at right angles and a Ray Box with a 12V, 24W bulb. Supplied with a cylindrical convex lens of focal length 75mm and two double screens, giving one wide slit and one each single, three and five slits.
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Mahesh Nagar, Ambala, Haryana