Time：2022-03-22 Views：
The principle of total reflection
If the light beam is directed from an optically denser medium to an optically sparser medium, the angle of refraction is greater than the angle of incidence, as shown in the figure.
If θ0 is continuously increased, the refraction angle θ1 can reach 90°, and the θ1 at this time is called the critical angle.
Total reflection occurs when light rays are directed from an optically denser medium to an optically sparser medium and the angle of incidence is greater than the critical angle.
Optical fibers use this total reflection to transmit optical signals.
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