Fringes Newton – Concavity and convexity of the surfaces under examination

In this article I will explore with a question of interpretation of the interference fringes, by means of the interferometer Newton, during the analysis of the optical surfaces. As I described in this article, the evaluation of the profile of the convex surface is performed picking her compare with a reference surface (concave) that can be spherical, parabolic or

I sferometro

The spherometer is a measuring instrument used in the machining of an astronomical mirror, to verify the depth of the sagitta, and then the radius of curvature of the surface under examination. The instrument itself is not complicated, It's consists of a rigid supporting structure on which are placed 3 supporting feet arranged