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I can't really understand with the question whehter I should use the Young Modulus double slit formula or the air wedge formula because Young Mudulus double slit does not involved refractive index ,n and in the air wedge,there is question on calculating the thickness.

So,I don't know what to do now because I get confuse with the question and have try so many times on calculation but still cannot get the answer.Help,I need somebody the help me figure out and explain to me what the question want.Thanks for anybody that spend sometime on this question.