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← ScienceWhich consequence results when cladding refractive index decreases in optical fiber?
A)Increased evanescent wave penetration✓
B)Reduced intermodal dispersion
C)Higher critical angle threshold
D)Decreased Rayleigh scattering losses
💡 Explanation
Decreasing the cladding's refractive index causes stronger evanescent wave penetration into the cladding because the acceptance angle decreases; therefore, more light leaks because less total internal reflection occurs, rather than decreased scattering losses with a different waveguide geometry.
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