In the instrument described, collimated light from the lens which is being tested is directed into a triangular path interferometer in which the two beams are sheared by tilting a single, parallel plate, while the path difference between them is varied linearly with time, over a range of one wavelength, by means of a polarizing system. The modulus and argument of the frequency response of the lens are obtained directly from the amplitude and phase of the resultant sinusoidal variation of the total flux in the interference pattern.
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Hariharan et al. (1960) studied this question.
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