**Category:**

Research Papers

**Sub-Category:**

Mechanics / Electrodynamics

**Date Published:**

November 28, 2019

**Keywords:**

Michelson-Morley experiment

**Abstract:**

This study starts with the geometry and derivation of the Michelson-Morley experiment for the initial position of the interferometer as presented by the authors, and then completes the derivation of the light paths and the fringe shift for the 90°, the 180°, and the 270° positions, when the interferometer is rotated in steps of 90° from its initial position. For this geometry, the rays that interfere cannot coincide. Starting with the rotation from the initial position to the 90° position, and continuing to the 180°, the 270°, and back to the initial positions, the predicted fringe shift is 0.8 fringes, -08 fringes, 0 fringes, and 0 fringes, respectively. The fringe shift from a position to another position of the interferometer is different from geometry to geometry. The result of the fringe shift for one geometry cannot be extended to any other geometry.

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