Superposition, Coherence & Intensity
In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case:
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Answer: (d)
- Sustained interference needs coherent sources of the same frequency.
- Red and green filters pass light of different frequencies, so the two slits are not coherent.
- The phase difference changes rapidly and no steady fringes form; the screen is just uniformly illuminated.
- So the answer is (d) there shall be no interference fringes.