JEE PHYSICS MCQ: WAVE OPTICS

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Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

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Correct option: D

Interference in which width of the fringe will be slightly increased

Option D is correct because evacuating the chamber reduces the refractive index, increasing the wavelength and thus slightly increasing the fringe width.

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