1. Lying in the optical path are two cells with transparent ends. 2. Optical path length ( OPL ) is constant between wavefronts.3. These inhomogeneities are localized differences in optical path length that cause light deviation. 4. The optical path is shortened and the light cube delivers bright illumination intensities. 5. SMS optics are also calculated by applying a constant optical path length between wavefronts. 6. The optical path length is constant between wavefronts. 7. For fine-tuning one can also change the optical path length of the resonator. 8. If the optical path length variations are more than a wavelength the image will contain fringes. 9. It is called mirrorless since it does not have a movable mirror in the optical path . 10. The optical path length is a purely geometrical quantity since time is not considered in its calculation.
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