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Thin-Film Interference in Different Media

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Two thin films, A and B, are made of a material with a refractive index of n=1.45n = 1.45. Both films have an identical thickness of t=λ/4t = \lambda/4, where λ\lambda is the wavelength of light within the film. Film A is surrounded by air (n≈1.0n \approx 1.0), and Film B is submerged in glycerin (n=1.47n = 1.47). How do the interference patterns for light reflected from each film compare?

A

Film A shows destructive interference, Film B shows constructive

B

Both films show constructive interference

C

Film A shows constructive interference, Film B shows destructive

D

Both films show destructive interference

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