Includes
• 1 rectangular block measuring 75x50x15 mm;
• 1 semicircular block, 90 mm base x 15 mm thick;
• 1 equilateral triangular block, 75 mm on a side, 15 mm thick;
• 1 block biconvex lens 90 mm long, 23 mm radius;
• 2 concave lens blocks 90 mm long, 10 mm radius.
Supplied in a wooden box.