Wave Optics Ques 26
26. Interference was observed in interference chamber where air was present, now the chamber is evacuated, and if the same light is used, a careful observer will see
[1993]
(a) no interference
(b) interference with brighter bands
(c) interference with dark bands
(d) interference fringe with larger width
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Answer:
Correct Answer: 26.(d)
Solution:
- (d) In vacuum, $\lambda$ decreases slightly compared to that in air. As $\beta \propto \lambda$, therefore, width of interference fringe increases slightly.
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