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ENTRANCE TEST – 2011 :: Discussion
| 6. | For interference of light waves to take place, the required condition is | |
| A. | The path difference of the light waves from the two sources must be large | |
| B. | The interfering waves must be non-coherent | |
| C. | The light waves may come from different sources | |
| D. | The light waves must come from two coherent sources | |
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