19. The soap-bubble film has index of refraction $n = 1.5$. There is air both inside and outside the bubble. What wavelength (in air) of visible light is most strongly reflected from a point on a soap bubble where its thickness is 100 nm? (Assume normal incidence)



(A)400 nm

(B)500 nm

(C)600 nm

(D)450 nm

(E)None of the above

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