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Which fringe shifting occurs when transparent film thickness varies?

A)Constructive interference path lengthening
B)Refractive index gradient increase
C)Destructive interference reflection decrease
D)Brewster angle polarization modulation

💡 Explanation

A thicker film increases phase shifts, causing constructive interference because the optical path length of light waves changes depending on thickness rather than changing refractive index, therefore fringes shift. Brewster's angle involves polarization with no thickness changes.

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