Outline of the contents: &QNWL]
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1. Basic Interferometers for Optical Testing y$<Vha
2. Phase-Shifting Interferometry %6--}bY^
3. Specialized Optical Tests 7H>@iI"?
4. Long Wavelength Interferometry ud fe
5. Testing of Aspheric Surfaces BnRN;bu
6. Measurement of Surface Microstructure ps$7bN C
7. Absolute Measurements <5=JE*s$NS
8. Concluding Remarks