Wave Optics31524.22Light reflecting from the lower surface of the air layer experiences phase reversal, but light reflecting from the upper surface of the layer does not. The requirement for a dark fringe (destructive interference) is then 2nairtmmmnλλλ===, where 0, 1, 2,m=…At the thickest part of the film ()2.00=mµt, the order number is ()692 2.00102546.110mtmλ−−×==×mm7.32=7Since mmust be an integer, =is the order of the last dark fringe seen. Counting the order along the edge of contact, a total of 0m=8 dark fringeswill be seen. 24.23With a phase reversal upon reflection from the
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