A 30 cm. diameter white painted steel disc marked from 0 to 360° at every 1°, with center mark, on a stable cast iron base. The main disc and the lamp house (with 12V, 24W bulb) can be....
A 30 cm. diameter white painted steel disc marked from 0 to 360° at every 1°, with center mark, on a stable cast iron base. The main disc and the lamp house (with 12V, 24W bulb) can be rotated and held in any desired position. With the lamp house, a rotatable disc with single, double, triple and quadruple slits and with adjustable lens carrier with lens for divergent, parallel or convergent light beams is provided. Optical elements provided for reflection are 50x25mm. plane glass mirror and a polished plated metal cylindrical mirror. Optical element for refraction are semicircular, bioconvex, bioconcave, right angle prism and a trapezoidal acrylic blocks. These optical elements have powerful magnets attached for fixing of blocks to the disc.
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Ambala Cantt, Ambala, Haryana 
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