A beam of light is sent directly down onto a glass plate(n= 1.5) and a plastic plate (n = 1.2) that forma thin wedgeof air (see the drawing). An observer looking downthrough the glassplate sees the fringe pattern shown in the lowerpart of thedrawing, with the dark fringes at the ends AandB. The wavelength of the light is 517 nm. Using the fringepattern shown in thedrawing, determine the thickness of the airwedge atB.
t = 12---Select---NnmAPaK

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