Answer: No TIR possible.
- A 62.5 degrees
- B 48.5 degrees
- C 41.8 degrees
- D No TIR possible
Correct answer: D. No TIR possible
Explanation: TIR requires going from denser to rarer medium. Glass n=1.5 > Water n=1.33, so TIR is possible. sin(C) = n<sub>2</sub>/n<sub>1</sub> = 1.33/1.5 = 0.887. C = 62.5 degrees.
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.