A piece of fine fiber with a diameter of D = 6.3 m is used to prop apart the edg

Question

A piece of fine fiber with a diameter of D = 6.3 m is used to prop apart the edges of two perfectly flat 2.7-cm-long pieces of glass (see diagram). When the setup is illuminated from above with light of wavelength = 605 nm, an interference pattern of alternating bright and dark bands will be seen in the reflected light. If the setup is viewed from high above, how many dark bands will be seen?

Note: The answer that I got was 9, but that is incorrect. 8, 10, and 11 are also incorrect. I do not know what I am doing wrong.

Explanation / Answer

A piece of fine fiber with a diameter of D = 6.3 m is used to prop apart the edg

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