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Yes, that is obvious. But to get a possible total internal refection at B, you need a maximum angle of refraction, and therefore a maximum angle of incidence. So they observe ( correctlyellieee said:
!) that for a maximum angle of incidence at A##\ ##ellieee said:
just to clarify, is it maximum angle of refraction and incidence at B ?BvU said:
The angle of incidence is the angle at which a ray of light or any other type of wave hits a surface or boundary between two different mediums.
The angle of incidence is typically measured from the normal, which is an imaginary line perpendicular to the surface at the point of incidence. It is measured in degrees.
Total internal reflection occurs when a ray of light or other wave hits a boundary between two mediums at an angle greater than the critical angle, and is completely reflected back into the original medium.
The critical angle is the angle of incidence at which total internal reflection occurs. It is dependent on the refractive indices of the two mediums and can be calculated using Snell's law.
Total internal reflection is used in various technologies such as optical fibers for telecommunications, endoscopes for medical imaging, and prisms for creating virtual images in binoculars and cameras.
