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A 230 mm diameter disc marked from 0 to 360 degree at every 1 degree, with centre mark, on a stable base. Supplied with set of 6 Optical elements A 230 mm diameter disc marked from 0 to 360 degree at every 1 degree, with centre mark, on a stable 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 50 mm wide. Optical element for refraction are semicircular, biconvex, biconcave, right angle prism and a trapezoidal acrylic blocks. These optical elements have powerful magnets attached for fixing of blocks to the disc.