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Question: 

If the wedge between the glass plates of Example 24–10 is filled with some transparent substance other than air— say, water—the pattern shifts because the wavelength of the light changes. In a material where the index of refraction is $n$, the wavelength is $\lambda_n = \lambda/n$, where $\lambda$ is the wavelength in vacuum (Eq. 24–1). How many dark bands would there be if the wedge of Example 24–10 were filled with water?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

33 dark bands, including the one at the point of contact.

Giancoli 7th Edition, Chapter 24, Problem 51

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Chapter 24, Problem 51 is solved.

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