Optical fiber cable

Glass-fiber-guided light beams are continuously reflected at the interface between glass and air. How large is the maximum angle \(\gamma\) (half opening angle) of the exiting light at the end of the glass fiber, in degrees, to the nearest integer?

The glass has a refractive index of \(n = 1.38,\) while the air has an index of \(n = 1.\)

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