A spacer is cut from a playing card of thickness 2.79 x 104 m and used to separate one end of two rectangular, optically flat, 2.80 cm long glass plates with n = 1.70, as in thefigure below. Laser light at 543 nm shines straight down on the top plate.HINTAdjacent dark bands occur when the air gap thickness changes by half a wavelength.iClick the hint button again to remove this hint.(a) Count the number of phase reversals for the interfering waves.1027 X(b) Calculate the separation (in m) between dark interference bands observed on the top plate.(No Response) m

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