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ENTRANCE TEST – 2017 :: Discussion
| 9. | The wave length of light which produces second order spectrum on diffractiong rating on which 5000 lines/cm are ruled at an angle of 30° will be: | |
| A. | 6x10–7m | |
| B. | 4x10–6m | |
| C. | 5x10–7m | |
| D. | 3x10–6m | |
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