MHT CET Physics 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

(A)interference in which width of the fringe will be increasedCorrect
(B)interference with bright band
(C)interference with dark band
(D)All of the above

Answer: (A)

Solution

Air has a refractive index slightly above , so on evacuating the chamber the wavelength increases slightly and the fringe width $β=λ

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Question ID VK-077305