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Casted, finished in grey hammertone paint, fitted with a 12 V 24 W line filament lamp through a lamp holder, with extended sides having grooves inside to fix slit plate and lens. Supplied complete with a metal plate having one and three slits and a cylindrical biconvex lens. Accessories: A plano convex lens with focal length 150 mm. A plano convex lens with focal length 300 mm. Set of three primary and three secondary color filters. A cylindrical biconvex lens of focal length 75 mm.

Physics & Electronic Laboratory Apparatus

$Consist of a steel disc diameter 500 mm. in matt white color, o o o marked at every 5 with bigger lines at 10 and 30 and with cross o cutting lines at 90 for taking centre. Disc mounted on a steel tube diameter 25 mm. length 400 mm. on a heavy stable cast tripod base. Disc freely rotatable at centre can be stopped at any position by friction disc. Lamp house in two parts, the outer rotatable and slotted gives light beams of varying width, narrow single, double and triple beams. Inner having the lamp holder and a 12 V 24 W s.b.c. axial filament lamp. Attached to the lamp house is adjustable lens carrier with lens to give diverging, parallel or converging light beams, lamp house mounted on a rotatable arm can be stopped at any position by friction disc. Accessories :- I. For Reflection: (a) A plane glass mirror size 50 x 25 mm., mounted in a wooden holder and with a magnet for attachment to the disc. (b) A polished plated metal cylindrical mirror of radius 75 mm. with two magnets. II. For Refraction: (a) A semicircular perspex block radius 50 mm., thickness 20 mm. with two magnets. (b) Lens biconvex, perspex, radius of curvature 180 mm. with two magnets. © Lens biconcave, perspex, radius of curvature 180 mm. with two magnets. o (d) Right angled 45 perspex prism.$