Convenient set of 8 bi-convex lenses with 50mm (5cm) diameter.  Set comprises of one each of the following focal lengths: 5, 10, 15, 20, 25, 30, 50 and 100cm (50, 100, 150, 200, 250, 300, 500 and 1000mm).

These are high quality, optically true lenses. Made of high quality polished glass and are spherical with round edges. Excellent for a variety of optical experiments.