Answer: 24.6 degrees.
- A 18.2 degrees
- B 24.6 degrees
- C 30 degrees
- D 40 degrees
Correct answer: B. 24.6 degrees
Explanation: sin(C) = 1/2.4 = 0.417. C = sin<sup>-1</sup>(0.417) = 24.6 degrees. That is why diamonds sparkle (TIR).
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.