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Question
Distinguish between the phenomenon of interference and diffraction of light.
Solution
| Sr. No. | Interference | Diffraction |
| 1. | Interference is due to the superposition of waves from different wavefronts. | Diffraction is due to waves coming from different parts of the same wavefront. |
| 2. | All bright fringes are of equal intensity. | Intensity decreases with the order of the bright band. |
| 3. | Minimum intensity may be zero. | Minimum intensity is not zero. |
| 4. | The width of the central maximum is same as that of other bright fringes, i.e fringe width is same for all fringes, including central maxima. | The width of the central maximum is broader than other maxima, and it is double the fringe width. |
| 5. | The waves emitted by two coherent sources travel in a straight line. | The light waves are bent at the corners and displaced from their straight-line path. |
| 6. | The resolving power of an optical instrument does not depend on the phenomenon of interference. | The resolving power of an optical instrument depends on the phenomenon of diffraction. |
| 7. |  |
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