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| Q. |
Which of the following is true about resolution in two frequency laser interferometer? |
| A. | straightness resolution – 90 nm |
| B. | angular resolution – 3 arc seconds |
| C. | flatness resolution – 2 nm |
| D. | linear resolution – 1 nm |
| Answer» D. linear resolution – 1 nm | |
| Explanation: the advantage of two frequency laser interferometer technique is that system does not depend upon the beam intensity and provides high sensitivity, it is also independent of noise due to air turbulence. the linear resolution by two frequency laser interferometer technique is 1 nm, angular resolution is 0.03 arc seconds and straightness resolution is 40 nm. | |
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