Which Statements Are True for Optical Fibers

Which statements are true for optical fibers?
I Optical fibers carry light by total internal refraction.
II Optical fibers are constructed of a high-refractive-index transparent core enclosed in a lower refractive-index transparent cladding.
III Optical fibers exploit Snells Law,n₁ sin ₁ = n₂ sin ₂,to transmit light along the length of the optical fiber.
IV If n₁/n₂ < 1,there is an allowed range of angles _i in which essentially all light is reflected at the walls of the core,with negligible amounts of light penetrating the cladding.

A) I and IV
B) I,II,and IV
C) II,III,and IV
D) II and III
E) II and IV

Correct Answer:

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