When monochromatic light shines perpendicularly on a soap film(n=1.33) with air

Question

When monochromatic light shines perpendicularly on a soap film(n=1.33) with air on each side, the second smallest nonzero filmthickness for which destructive interference of reflected light isobserved is 296nm. What is the vacuum wavelength of the light innm? I'm not sure where to begin. When monochromatic light shines perpendicularly on a soap film(n=1.33) with air on each side, the second smallest nonzero filmthickness for which destructive interference of reflected light isobserved is 296nm. What is the vacuum wavelength of the light innm? I'm not sure where to begin.

Explanation / Answer

n = 1.33, t2 = 296 nm, find 2ntm + /2 = m + /2 2nt2 = 2 = nt2 = 394 nm

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