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## Homework Statement

Light of wavelength 547nm is incident perpendicularly on a soap film (n=1.31) suspended in air. What is the smallest nonzero film thickness for which reflected light undergoes constructive interference?

## Homework Equations

2t = (m + 1/2)(wavelength/nfilm)

## The Attempt at a Solution

t = (0+1/2)(547nm/(2*1.31))

t = 104 nm

Is this correct?

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Could someone please check this as well: https://www.physicsforums.com/showthread.php?t=310439