^Curved surface refraction formula
It is a general expression, applicable to both convex & concave surface, for both point & extended object placed in any medium rare or denser, for any type of image formed (real or virtual).
While using this result keep in mind following points:
- All distance are measured from the pole P (i.e. the centre of surface at which incident ray strikes.
- μ1 → Medium from which incident ray comes.
- μ2 → Medium towards which incident ray is sent.