Use the Following Figure Below for the Next Problem $\theta$ ,So That the Light Ray Is Totally Internally Reflected Inside

Multiple Choice

Use the following figure below for the next problem.
The figure shows a cross-
-A fiber optic is made by cladding a thin fiber core of refractive index n₁ = 1.45 with a material of refractive index n₂ = 1.38.What is the maximum incident angle, $\theta$ ,so that the light ray is totally internally reflected inside the fiber?

A) 24.1º
B) 26.4º
C) 28.2º
D) 30.3º
E) 32.7º