The elementary laws of lenses and mirrors can be studied 
very economically and quite satisfactorily with this widely 
used bench. The bench is made of wood with a 1-meter 
scale graduated in millimeters fixed on one side and having 
a ‘V’ groove on both sides. The set consists of 4 holders 
with tightening screws mounted on a light metal slide 
carriage with a base 75 x 75 mm (l x b) having a pointer 
line, that can slide in the grooves of the bench along the 
scale. One slide carriage is provided with a transverse 
motion for centering. Suppied with two lens holder and 2 
general purpose holders. Overall dimensions: 1120 x 100 x 
75 mm (l x b x h). Additional attachments can be supplied 
at extra cost.