Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.0 × 10^-6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 490 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 13
c. 9
b. 7
d. 17
A
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