| 21. | The transmission gratings, which swing into the optical path behind the mirrors, provide Chandra with high resolution spectroscopy.
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| 22. | In this manner, gravity ( fail safe ) returns the red roundel into the lamp's optical path.
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| 23. | Also the difference in optical path length through each of the two objective lenses is carefully aligned to be minimal.
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| 24. | Since the beam is no longer traveling the full optical path length to the floor, its reflected angle changes.
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| 25. | The Gladstone Dale term ( n " 1 ) is the non-linear optical path length or time delay.
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| 26. | The optical path difference between the paths taken by two identical waves can then be used to find the phase change.
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| 27. | In the simplest case, a single gel is inserted into the optical path to produce light of the same color.
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| 28. | The intensity data as a function of the optical path difference are processed and converted to height information of the sample.
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| 29. | Also, the difference in optical path length through each of the two objective lenses is carefully aligned to be minimal.
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| 30. | In this mode no dispersive element is placed in the optical path and any objects are directly imaged on the detector.
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