This is good working bench for junior students. It comprisesa wooden base boardlllOxll5mm(LxW) with a one meter sea Ie divided in mms and figured at cms, is fixed along the front edge. Supplied complete with following accessories mounted on 100 x 50mm bases(a) 2Nos Object and receiving screens (b) INo Plane mirror 150x100 mm mounted on a base. (c) 4Nos Lens holder with V grooves (d) 1 No Needle mounted vertically in a short wooden rod (e) INo Candle Holder Optical centre height of all components is 100 mm.