A Spherometer is placed on a flat glass plate and then on a convex surface. The difference in the central screw readings (h₂ – h₁) is known as the Sagitta (h). If the distance between the legs is l, the Radius of Curvature R is given by:
A Spherometer is placed on a flat glass plate and then on a convex surface. The difference in the central screw readings (h₂ – h₁) is known as the Sagitta (h). If the distance between the legs is l, the Radius of Curvature R is given by: