total internal reflection
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The complete reflection of light within a denser medium when it hits the boundary with a less dense medium at an angle steep enough that none of it escapes.
Test yourself
Which word fits the gap? "_____ is what keeps light bouncing along the length of an optical fibre instead of leaking out the sides."
Answer: total internal reflection
In your own words, what does "total internal reflection" mean?
The complete reflection of light within a denser medium when it hits the boundary with a less dense medium at an angle steep enough that none of it escapes.
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