Answer: 53.1 degrees.
- A 53.1 degrees
- B 41.8 degrees
- C 30 degrees
- D No TIR since going to less dense
Correct answer: A. 53.1 degrees
Explanation: n<sub>A</sub> > n<sub>B</sub> so TIR is possible. sin(C) = n<sub>B</sub>/n<sub>A</sub> = 1.2/1.5 = 0.8. C = sin<sup>-1</sup>(0.8) = 53.1 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.