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STD 12 - 10. Wave optics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 10. Wave optics4 Marks
Question
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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Answer

(d)The refractive index of air is slightly more than $1$. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.

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