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Which consequence results when an optical flat shows fringes?

A)Air wedges cause constructive interference
B)Wavelength exceeds the surface separation
C)Total internal reflection becomes impossible
D)Refractive index becomes position dependent

💡 Explanation

Constructive interference depends upon the air wedge causing specific path differences. Bright fringe arises because waves add in phase, therefore bright fringes appear rather than complete transmission; a varying refractive index would distort, not create clear, fringes.

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