Abstract
The objective of a metallurgical microscope used as a microinterferometer has been restricted to low power lens. For, it has been considered that to observe the interference fringes by high power lens is likely to involve optical difficulties.In this experiment, the interference fringes could be observed with high lateral resolution and magnification by overcoming the optical difficulties.The objectives used in this apparatus were × 40 lens of numerical aperture of 0.64 and × 120 lens of numerical aperture of 1.25 (Oil). Photographic interference fringes were much superior to the best ones obtained by low power lens.
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