Two flat glass plates touch at the left end and are separated by a sheet of this

Question

Two flat glass plates touch at the left end and are separated by a sheet of this paper at the right,
producing a thin wedge of air in the region between the plates. This system has monochromatic
light shining down on it. At a place where the thickness of this air film is 1.0 x 10^3
nm, an appropriate wavelength in the visible range for constructive interference would be:

a. 500 nm.
b. 570 nm.
c. 670 nm.
d. Constructive interference occurs here for all wavelengths in the 400 to 700 nm range.
e. Constructive interference isn't possible for anything in the 400 to 700 nm range.

Explanation / Answer

a. 500 nm

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