OPTICAL BENCH ‘U’ SHAPE
Optical Bench having a ‘U’ channel with a scale printed. It has three feet of which two are adjustable and one is fixed. It is provided with four sliding saddles with a pointer. The saddle accepts holders with a 10mm diameter rod. It is supplied complete with two Lens Holders, Light Source, Slit, White Screen, and Translucent Screen (15 x 15 cm). Power Supply for Light source is not included in the scope of supply.
Scale: 160cm, graduated in mm.
Saddle: Plastic moulded, hole dia. 10mm
Holder: Plastic moulded, rod dia. 10mm, aperture 36 mm, Lens Dia . 40 mm
ADJUSTABLE SLIT 
Rectangular plastic frame. With provision to hold a Metallic slit plate and movable lever. Slit width 2mm. Height 15mm. Suitable to use with optical bench 
WHITE SCREEN 
Size: 15cm X 15cm. Suitable to use with optical bench 
LENS HOLDER 
Rectangular plastic frame lens holder. With provision to hold filters also. Lens of Dia 40mm can be held through round spring rings. 
Suitable to use with an optical bench. Focal length 10cm.
DIAPHRAGM – ARROW SLIT/SINGLE SLIT 
The set consists of a single slit diaphragm and an Arrowhead diaphragm.
Length of Arrow: 1.5 cm
Length of Single slit: 1.5 cm
Dimensions: 5 x 5 cm (approx.)
FILTER FOR COLOUR MIXING 
For the experiment on colour mixing.
Dimensions: 5 x 5 cm (approx.)
LIGHT SOURCE HALOGEN ('U' BASE) 
It is a high-intensity halogen light source (12V, 50W). A condenser and a draw adjustment make obtaining an adjustable convergent beam possible—proper ventilation through side frame windows. 
Suitable to use with 'U' shaped optical bench SL668 Input: 12V DC through 4mm safety sockets.
LENSES
Double convex lens dia 40mm, F.L. 100mm. 2pc. 
Double convex lens dia 38mm, F.L. 100mm. 2pcs. 
Double convex lens dia 40mm, F.L. 200mm. 2pc. 
Double concave lens dia 38mm, F.L. 50mm. 2pc. 
Double concave lens dia 38mm, F.L. 150mm. 2pc.