We compare and contrast concave and convex lenses by drawing ray diagrams. In this Closer Look segment on Lenses, we compare and contrast concave and convex lenses by drawing ray diagrams and ...

An inhomogeneity class of 0 means that the maximum permissible variation of index of refraction is +/- 50 x 10 -6. An inhomogeneity class of five means that thelens has a maximum permissible variation ...