The minimum thickness of soap bubble is 145.7 nm.
We know that the condition for constructive interference:
2nt = λ/2
where,
n = refractive index
t = minimum thickness
λ = wavelength
Here n = 1 ( refractive index of water)
i.e. t = λ/4
Given wavelength (λ) = 583 nm
Putting this value in above equation we get: t = 145.7 nm
So the minimum thickness of a soap bubble is 145.7 nm.
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