How many interference fringes are observed per centimeter

A plate of glass 9.50 long is placed in contact with a second plate and is held at a small angle with it by a metal strip 7.80×10-2 thick placed under one end. The space between the plates is filled with air. The glass is illuminated from above with light having a wavelength in air of 660 . How many interference fringes are observed per centimeter in the reflected light?

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Physics: How many interference fringes are observed per centimeter
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