Mirror concave/convex, adjustable

For experiments on reflection, image construction and imaging a point on concave and convex mirrors;
Flexible mirror foil, mounted between two columns, the distance between the columns can be adjusted and locked, allowing concave or convex mirrors to be set with any focal length
Mirror surface: approx. 58 x 20 mm
Dimensions: 90 x 20 x 32 mm
Mass: approx. 31 g