A fiber optic line is composed of a core with an index of refraction of 1.51 and cladding with an index of 1.40.Which one of the following relations best describes angles of incidence that will result in total internal reflection within the fiber optic line?

Question

Quizplus · Accepted Answer

The critical angle for total internal reflection is given by:

sinθ = n2/n1

where n1 is the index of refraction of the core and n2 is the index of refraction of the cladding.

Plugging in the values we get:

sinθ = 1.40/1.51

sinθ ≈ 0.927

Taking the inverse sine of both sides:

θ ≈ 69.1 degrees

Therefore, any angle of incidence greater than 69.1 degrees will result in total internal reflection within the fiber optic line.

Option B is the best choice as it shows an angle of incidence greater than 69.1 degrees.

A Fiber Optic Line Is Composed of a Core with an Index