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Consider these statements about optical fibres and total internal reflection: (I) a fibre’s operation is based on total internal reflection, (II) total internal reflection requires the angle of incidence to exceed the critical angle, and (III) the critical angle is very small for light going from diamond into air. Which are correct?

1. Consider these statements about optical fibres and total internal reflection: (I) a fibre’s operation is based on total internal reflection, (II) total internal reflection requires the angle of incidence to exceed the critical angle, and (III) the critical angle is very small for light going from diamond into air. Which are correct?

 

All three statements hold: fibre optics relies on total internal reflection, which needs an angle of incidence beyond the critical angle, and diamond’s high refractive index gives it an especially small critical angle.

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