The discussion centers on the concept of "critical rays," specifically in the context of critical angles and total internal reflection. The critical angle occurs when the angle of refraction reaches 90 degrees, resulting in total internal reflection of light within a medium where the refractive index of the first medium (n1) is greater than that of the second medium (n2). This phenomenon is crucial for understanding how light behaves at the interface of different materials.
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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.Sabalaba said:
