Which mechanism causes total internal reflection in optical fiber near a sharp bend?

💡 Explanation

When an optical fiber bends sharply, the evanescent field, a portion of the light wave extending beyond the core, decays rapidly beyond the critical radius because of the increased angle of incidence. Therefore, evanescent field decay results, rather than the stated alternatives which arise because of other distinct physical phenomena.

• Which increased risk follows when volatile liquid rocket propellant experiences rapid depressurization?
• Which inaccuracy results when applying Bernoulli's equation to model hydraulic fracking?
• Which outcome results when strong gravitational fields alter spacetime?
• Which risk increases when injecting excess current into an electrochemical cell?
• Which outcome occurs when exceeding the equilibrium constant in Haber-Bosch process maintaining constant temperature and volume?
• Which outcome occurs in a tokamak reactor when plasma confinement degrades?