A step-index optical fiber is submerged in water; which consequence follows for light propagation?

💡 Explanation

When an optical fiber is submerged in water, the refractive index difference between the fiber core and the surrounding medium decreases. This causes a decrease in the critical angle for total internal reflection, because light is less likely to be completely reflected within the core; therefore, fewer total internal reflection events occur, rather than increased events if the index difference remained higher.

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