A perfectly flat piece of glass (n = 1.50) is placed over a perfectly flat piece of blackplastic (n = 1.20) as shown in the figure a. They touch at A. Light of wavelength 600nm is incident normally from above. The location of the dark fringes in the reflectedlight is shown on the sketch of figure b.(a) How thick is the space between the glass and the plastic at B?(b) Water (n = 1.33) seeps into the region between the glass and the plastic. How manydark fringes are seen when all the air has been displaced by water? (The straightness andequal spacing of the fringes is an accurate test of the flatness of the glass.)(a)(b)AGlass =1.50Plastic n=1.20B

Given that : The refractive index of the glass n1=1.5 The refractive index of the glass n2=1.2 The…

Answered: A perfectly flat piece of glass (n =…

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