Answer: 37.2°.
- A 30°
- B 37.2°
- C 48.6°
- D 60°
Correct answer: B. 37.2°
Explanation: n = sin((A + δ)/2)/sin(A/2); 1.5·0.5 = 0.75 = sin((60 + δ)/2) → δ ≈ 37.2°.
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.