The condition for constructive interference for the given condition is:
m = 0
This implies that:
2ηd = (1/2)λ
d = λ/4η
The minimum bubble thickness that will produce interference color is:
As a soap bubble with n = 1.333 evaporates and thins, reflected colors gradually disappear. What are
(a) the bubble thickness just as the last vestige of color vanishes and
(b) the last color seen?
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