Methods available for interference microscopy of opaque objects at high wedge angles are discussed and formulae for interpreting interferograms are derived. Fringes can be resolved with wedge angles up to 30° both with the Zeiss-Linnik interference microscope and with an ordinary bench microscope using an oil immersion lens and parallel illumination (Fizeau system). The accuracy with which these angles can be measured is poor, about 10% for the highest angle resolvable, but the accuracy increases proportionately with decrease of angle. Some interferograms illustrating the capabilities and drawbacks of the methods are given.
No takes yet. Share an insight, caveat, or question.
H. Mykura (1954) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: