Edexcel A Level Physics:復習筆記5.15 Total Internal Reflection
Total Internal Reflection
- Total internal reflection (TIR) occurs when:
The angle of incidence is greater than the critical angle and the incident refractive index?n1?is greater than the refractive index of the material at the boundary?n2
- Therefore, the?two?conditions for total internal reflection are:
- The angle of incidence,?θ1?> the critical angle,?C
- Refractive index?n1?> refractive index?n2?(air)
Diagram showing refraction, the critical angle and total internal reflection
- Two conditions are necessary for total internal reflection to occur:
- The light must be going from a?more dense medium?into a?less dense?one
- The?angle of incidence?must be?greater?than the?critical angle
Exam Tip
If asked to name the phenomena make sure you?give the whole name?- Total Internal Reflection. Remember: Total Internal Reflection occurs when going from a?more dense to?a?less dense?material and?ALL?of the light is reflected. If asked to explain what is meant by the?critical angle, you can draw the diagram above (showing the three semi-circular blocks).
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