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Abstract
Modulation of a general periodic object of a triangular wave profile has been investigated in the case of a polarizing microscope with crossed nicols. Expressions for the irradiance distribution have been derived. The system has been assumed to be operating in incoherent illumination. Results in the form of curves have been given for the irradiance distribution and triangular wave response of the optical system. The limiting case when the triangular wave object reduces to an object of infinitely thin lines has also been discussed. A close similarity has been shown between the triangular wave response for a particular object function and the sinewave response of the system.