A white light is normally incident on a soap bubble of thickness 0.40 um and refractive index 1.4 , which wavelengtts may cause bright fringes?
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A white light is normally incident on a soap bubble of thickness 0.40 um and refractive index 1.4 , which wavelengtts may cause bright fringes?
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Explanation:
n1 = n2 < n3
A phase change of π takes place at point A, but not at B. Hence for a constructive interference to be obtained, the condition is-
2μd cos r = ( m - 1/2 )λ
λ = 2μd / ( m - 1/2 )
λ lies in visible region only for m = 8
λ (m=8) = 5320A°
Hope this helps.
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