Answer: 42 degrees.
- A 30 degrees
- B 42 degrees
- C 45 degrees
- D 60 degrees
Correct answer: B. 42 degrees
Explanation: sin(C) = 1/n = 1/1.5 = 0.667. C = sin<sup>-1</sup>(0.667) = 41.8 degrees, approximately 42 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.