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"Critical" in reflected and refracted rays

  • Thread starter Sabalaba
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  • #1
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Hello,

I didnt understand what the "critical" in critical rays are. I didnt understand the meaning.
Can someone help, please.

Thanks.
 

Answers and Replies

  • #2
nrqed
Science Advisor
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Hello,

I didnt understand what the "critical" in critical rays are. I didnt understand the meaning.
Can someone help, please.

Thanks.
Hard to tell without more context. I assume you are talking about critical angles, for total internal reflection (ray coming from side 1 and ##n_1>n_2##)? This is when the angle of refraction reaches 90 degrees and pretty much all the energy is reflected inside the material (I assume n1 > n2). Then we have ##theta_2=90## and you can find the critical angle inside the medium.
 
  • #3
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Thank you for you help:smile:
 

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