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  • WORKING MIRRORS
    • - Environment and tools
    • - Techniques
    • - Materials and abrasive
    • - Roughing and grinding
    • - Polishing
    • - Parabolizzazione
    • - Correction of defects
    • - Secondary mirror
    • - Constructive Report
    • - Science and Technology
  • OPTICAL MEASUREMENTS
    • - theoretical aspects
    • - Foucault Test
    • - Ronchi Test
    • - Interferometria
  • DOBSON
    • - Projects and dimensioning
    • - building elements
    • - Handling and transport
  • FORUM
    • - presentations
    • - Processing parabolic mirror
    • - Optical Test
    • - DIY
    • - The board of Grattavetro.
    • - Manifesto of Grattavetro

Tag Archives: Newton's fringes

Home / Posts Tagged: Newton's fringes

How to read the fringes of Newton and correct the convex mirror.

Dec 5, 2016Massimo MarconiSecondary mirrorNewton's fringes, sub diameter

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

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