A light source of unknown wavelength is incident normally on  a glass plate which is placed over another glass plate at an angle 0.006deg. There is an air film of varying thickness created between them. If the two consecutive bright fringes are obtained at 3mm distance, what is the difference between the width of the film at those consecutive bright fringes.  The interference pattern considered above is the interference of reflected rays

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A light source of unknown wavelength is incident
normally on  a glass plate which is
placed over another glass plate at an angle 0.006deg. There is an air film of
varying thickness created between them. If the two consecutive bright fringes
are obtained at 3mm distance, what is the difference between the width of the film at those consecutive bright fringes.  The interference pattern considered above is the interference of reflected rays

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