How to read the fringes of Newton and correct the convex mirror.
As we have seen in this article, a convex secondary mirror can not be tested directly in general (*) . One of the methods is used to refer to a concave mirror which has the same shape of the surface that we want to get on the convex mirror. By overlaying the two mirrors, the analysis of the interference fringes by means of
How to build focal lenght and mirror's depth.
One of the aspects that usually remain unclear, during the design phase of a mirror roughing is what must “to dig” to reach the focal length of the project, before moving on to the next abrasive granulometry. Who has a fair number of self-built mirrors, now it possesses the experience is the ability to assess whether it is digging
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