Specification: Three Perspex bar pieces: Plano Concave Lens, Double Convex Lens and Plano Concave Lens. Each made from Perspex sheet of size 50 mm x 20 mm x 12mm/15mm.

Specification: Dia = 28 mm, half of the diameter x 14 mm height.

Specification: Assembled in Perspex transparent sheet, stable body, overall height 130 mm, Thick rectangular base 170 mm x 120 mm attached with two coils, output 15 V and 500 mA.Brass/Gun metal Bush on both ends in the centre, shaft and upper gear shaft.

Specification: Borosilicate Glass, 90mm height x 20 mm dia with cork.

Specification: Borosilicate 3.5 mm thick glass, neck inside dia. 18/19 mm × 20/22 mm height. Overall length 85/95 mm × inside dia. 55 mm with rim diameter 62/64 mm. To fit item No.13 from inner side, item no.28 from upper side and item no.73 from upper side mouth.

Specification: Borosilicate. Thickness 1.5 mm with one mouth dia. 26 mm x 25 mm height (with rim) and other dia. 06 mm x 28 mm length. Bulb outer dia. 48 mm with overall length 110 mm. Item no.63 fits into upper mouth.

Specification: Glass, Focal length 20 cm and dia. 50 mm.

Specification: Glass, Focal length 20 cm and dia. 50 mm.