MCQ
For the sustained interference of light, the necessary condition is that the two sources should
- ✓Have constant phase difference
- BBe narrow
- CBe close to each other
- DOf same amplitude
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| Length | Diameter | Potential difference | |
| $(A)$ | $L$ | $3d$ | $V$ |
| $(B)$ | $2L$ | $d$ | $2V$ |
| $(C)$ | $3L$ | $2d$ | $2V$ |