Answer: Denser to rarer medium beyond critical angle.
- A Denser to rarer medium beyond critical angle
- B Rarer to denser medium, at angles below the critical angle
- C Any medium to any other medium regardless of angle of incidence
- D Vacuum into any denser medium at the angle of incidence
Correct answer: A. Denser to rarer medium beyond critical angle
Explanation: TIR occurs when light goes from denser to rarer medium at angle of incidence greater than the critical angle.
Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.
Concept context
Reflection, refraction, lenses, mirrors, total internal reflection.