Compute the thickness of the film, Physics

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Q. A light of wavelength 60000A falls normally on a thin air film, 6 dark fringes are seen between two points. Compute the thickness of the film.

2μt = nλ

Thickness of the film t     = nλ/ 2μ

     = 6 X 6000 X 10 -10/ 2

     = 1.8 X 10-6 m.


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