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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:

1. no interference
2. interference with brighter bands
3. interference with dark bands
4. interference fringe with larger width

Correct answer: interference fringe with larger width

Solution

When the chamber is evacuated, the wavelength of light increases because the refractive index of air is slightly greater than that of a vacuum. This increase in wavelength leads to an increase in fringe width, as fringe width is directly proportional to the wavelength.

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