Outline of the contents: u3!aKXnv<
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1. Basic Interferometers for Optical Testing A#s`!SNv
2. Phase-Shifting Interferometry NLe+
3. Specialized Optical Tests Sz\"*W;>
4. Long Wavelength Interferometry eqt+EiH
5. Testing of Aspheric Surfaces Jjb(l W
6. Measurement of Surface Microstructure j8@Eqh
7. Absolute Measurements hcQvL>
8. Concluding Remarks